@Brand X,
I think Sanders is going to stay in until the convention, but I think the tone is probably going to change somewhat. He's lost. Sure, there are plenty of states left, but they all award delegates proportionally. He is hundreds behind on directly elected delegates and that doesn't even count the super delegates where he is many hundreds behind. He didn't make a mark with Hispanics in Texas or African Americans in the South, he lost Massachusetts, a state where the demographics noticeably favored him. He did have nice wins in Oklahoma and Colorado, but it's just not enough. He may actually get less delegates in Colorado than Clinton (due to the way the counties break out) and will likely only get a handful more in Oklahoma. In Texas, Clinton beat him by almost a hundred delegates. I think the move from here on out is to push his agenda and keep Clinton left of center but back off the direct confrontations unless Clinton starts to tack back to center.