Before we go too crazy over the poll numbers, I'll bet some of those polled were called prior to Trump's statement. It looks like this was the final straw for Trump with respect to the GOP leadership, although Trump is pulling his independent run card to try to slow down their work against him. At this point, I think they have to call his bluff. Kasich has been pointing this out for a while, and now the other "establishment" candidates are doing it too. Trump is a lot of bluster. Any time someone else gets any media attention, he lets loose with something that gets him into circulation again. I haven't done a statistical analysis, but it seems like most of these sorts of comments come early in the news week. He dominates the news for the week lights another fire cracker over the weekend or early the next week. He's not spending much for advertising. He's letting the media do that for him.