let's bring back tal kopan. tal, i think one of the most interesting things is watching bernie sanders with his approach to barack obama. hillary clinton has been in the past couple of weeks trying to immerse herself. she claims she's the one carrying on the obama legacy. bernie sanders seemed to edge in. take a listen. >> literally it turns out the day obama was nominated, they said, what are we going do. obstruct, obstruct, obstruct, make it as difficult as he could to do anything. now, we have had to fight through that, and i've but at the president's side time and time again, and this is on top of the birther issue with donald trump and others, a racist effort to try to de-legitimize the president of the united states. >> i believe it was what justice in the past he truly admired, which he got to at the end. it was thurgood marshall. but, yes, out of the blue he sort of brought up president obama and what he claimed were racist attacks against him. there are two things you have to keep in mind here. what we