The Republicans know Trump is a lost cause. The trouble is, they have no one else to run. So they are already in salvage mode, ie save the House majority.
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You know what would be best? Crickets during his speech at the convention.
I wouldn't count Trump out yet; so far he's outperformed expectations. Lets look at trends over time, both in the polls & betting markets. I think that the Republicans are trying to insulate themselves from Trump, but only in so far as he exposes what they're really about.
I think that the current Republican outrage is fake. They're not angry about what he is saying. They're angry that he's saying it openly, with a bullhorn; instead of behind closed doors, in hushed whispers. Do you really think Romney would have uttered his 49% comment if he knew it would end up where the public could see it? I sure don't. I wonder what's being said that the general public will never see.