the man accused of killing two virginia college students is agreement. the latest in the case against jesse matthew junior. carl spencer, brother - i'll never be able to get over him until i find out what happened." plus ... the brother of a man killed following an officer involved shooting speaks out. the new details police are revealing.

abc's cecilia vega in virginia now. >> all right, everybody, fired up! >> reporter: tonight, hillary clinton hoping to sweep the south and win super tuesday. >> if you go out and vote for me tomorrow, i will stand up and fight for you throughout this campaign, no matter who the republicans nominate. >> reporter: in virginia, with just hours left until voting begins, clinton feeling confident. >> just happy to be in virginia, working hard for every single vote. >> reporter: she's riding a wave of momentum after her south carolina blowout, winning 86% of the black vote. that's even more than president obama won in 2008. now, she's looking for a repeat tomorrow in states like georgia and alabama, where african-americans make up half of all democratic voters. >> and tomorrow, this campaign goes national. >> reporter: bernie sanders now facing tough questions about the future of his campaign. >> we got decimated, but eddecimated. but we got killed. >> reporter: while he packed in the crowds today -- >> we can win. no question. here in minnesota. if we have a

here's dean reynolds. >> reporter: campaigning in virginia today, donald trump was boasting again. >> we have amazing endorsements, and the people that really mean... we have hundreds of people now that want to endorse. >> reporter: but praise from david duke, former grand wiz of the ku klux klan, may test his following more than ever. >> voting for these people. voting against donald trump at this point is reallyre your heritage. >> reporter: last friday trump seemed the say no thanks. >> i disavow. okay. >> reporter: but sunday he declined to renounce the kkk, duke or his support. >> i don't know anything about david duke. okay. i don't know anything about what you're even talking about with white supremacy or white supremacists. so i don't know. >> reporter: trump eventually tried to clear up any confusion. >> i disavowed david duke all weekend long on facebook and twitter. >> reporter: he said a bad earpiece made it hard to hear the question about the kkk on sunday, even though he used the same one for several interviews. in any case it's clear some far right groups like what they

rally in virginia, that's a taken down by a secret service agent. our team on it all, and abc's tom llamas, leadings off from georgia. >> reporter: tonight, on the eve of super tuesday, tension virginia. >> get them out of here, please. >> reporter: a large group of student protesters marched out of the event. as they pass, a photographer from "time" magazine, thrown to the ground by a secret service agent. watch again. photographer's neck. then, with the man still on the ground, an angry exchange of words. the secret service now investigating. but that wasn't all. trump singling out another protester, asking if she's mexican. >> are you from mexico? are you from mexico? right smack in the middle of my punch line. >> reporter: today's confrontations coming as the republican front-runner finds himself in the middle of a new controversy. dodging a question about whether former ku klux klan grand wizard david duke. >> would you say, you condemn support? group. i mean, i don't know what group you're talking about. >> i mean, i'm just talking klan here.

was supporting donald trump, a group of black lives matter protesters interrupted a trump rally in virginia. [bleeped] [bleeped]. a "time" magazine photographer tried to leave the press area to shoot the protesters as they were escorted from the venue. he was thrown to the ground by a secret service agent. photographer chris morris later admitted to cursing at the agent before the confrontation became physical. morris said the agent grabbed him by the neck and put him in a chokehold. >> i'm dealing with some real sleaze bags up here, believe me. i think the press is worse. i'm telling you. they're worse than the politicians. >> reporter: trumps make a sport of criticizing reporters and makes it clear protesters are unwelcome. >> out. get out. out. >> reporter: trump's momentum toward the g.o.p. nomination has brought a sharper edge to his already-raucous rallies. marco rubio complained today the gutter rhetoric makes headlines. >> what a sad indictment on the state of the political debate in this country today. [applause] rubio himself dove into the mud. >> and you know what they say about

in virginia, the funeral is tomorrow for the prince william county police officer who was gunned down on her first day on the job. today the prosecutor said he may seek the death penalty. here's justice correspondent jeff pegues. >> reporter: 28-year-old ashley guindon was a decorated marine corps reservist who was just beginning a new career as a police officer. but her first day in uniform would be her last. >> all units respond. shots have been fired. >> reporter: on saturday night she and two other officers were responding to a domestic violence call at this home. as the officers approached the front door, they were shot. >> i know he's got a long gun. we got some people who need some assistance over here. >> reporter: guindon was was pronounced dead a few hours later. the two other officers are expected to survive. police say 32-year-old ronald hamilton opened fire on the officers with a rifle. hamilton, a staff sergeant in the u.s. army, is also accused of killing his wife, crystal hamilton, in the home. the couple's 11-year-old son managed to run to safety. according to the arm

. >> reporter: tensions high in radford, virginia. secret service body slamming a "time" photographer who tried to leave the campaign mandated press pen. trump on edge, too. this morning blaming his refusal to condition dem the kkk and david duke in a cnn interview on a bad ear piece. >> i'm sitting in a house in florida with a very bad earpiece that they gave me, and you could hardly here what he was saying. >> reporter: a complaint he did not make during that interview. >> i don't know anything about david duke, okay. i don't know anything about what you're even talking about with white supremacy or white supremacists, so i don't know. >> reporter: trump disavowed the cline's infamous former leader last week. david duke and robo calls, white supremicist movement supporting you. any words for that? >> i disavow it and didn't know it. >> reporter: trump cited the one-time grand wizard as the reason he wouldn't run in the reform party ticket in 2000. joined, a bigot, a racist, a problem, not exactly the people you want in your party. >

. >> in injury virginia black lieches matter protesters taking a stand at the donald rump rally. >> get them out. get them out? are you from mexico? trump pausing until police building. all right folks. you're going to hear it once. all lives matter. >> is. >> reporter: so senator rubio watching the returns here in his own backyard and up i-95 in ball palm beach county, that's where donald trump will be watching returns with his campaign staff and look heading to the florida primary on march 15th, it's a leading by double digits over the rest of the gop candidates snil this raise. reporting in southwest miami-dade. jeff lennox. 7seven. >> lynn: neen miem milan yeah trump going on the record on what it is likikto be married to the republican front runner. she told anderson cooper that she doesn't always agree with the controversial candidate. >> you don't try to change him? >> i don't. he is an adult. he knows the consequences a so i let be who he s. i give him my pbz, many, many taims and a don't agree with everything what he says but you know, that i under mall. i'm my own person. i te

is with the clinton campaign in virginia. kristen kristen, what can you tell us. >> reporter: lester, good evening. clinton campaign officials say they feel confident heeding into super tuesday after that big win in largely by support. clinton hoping to build on that tomorrow. senator sanders vowing not to give up, but he does have a steep you look at the numbers, lester. the official nbc news delegate count shows clinton with 519 delegates and sanders with 86. if you only take into account super delegates, typically party leaders who get to choose who they will support, clinton gets 428 to sanders 21, a 20-field advantage. clinton is up with ads in all of the super tuesday states and sanders with ads in five of them, smaller, less diverse states like colorado and massachusetts. still, sanders has a lot of cash on hand which means no matter what happens tomorrow that could allow him indefinitely. lester? >> kristen welker tonight, thank you. >>> for many of you the stations will be carrying the live hour-long editions of "nig