Sorry, that's not what Bowser's been plugging.
He's talking about some kind of pledge signed by a number of House members, or Senate members (it varies) declaring that they will oppose everything Obama is doing.
Hint: I've looked.
As for Mitch? Good God, the entire function of the Democratic Party from 2000 on was the political destruction of George W. Bush. I know that was pretty much the only thing liberals had to talk about on this board. If anyone thinks this kind of attitude in politics is reminiscent of "brownshirts," they're really reaching.