 There are some rules about how you would have a contested convention. I have to be honest and say I don't know them myself because we never thought it would come to this. But I do know that Democrats within the party are circulating them among themselves as they think about how they could do this. I think realistically, unless Joe Biden agrees to step aside, it's very unlikely that he could be successfully challenged for the nomination. The question is whether over the next few days there are people turning up at the White House and there are congressional Democrats saying that this is what they plan to do next week.