One of the ironies of America politics is that the House of Representatives, designed to be the “mob” of political power, is the top-down, well-run branch of government, and the Senate is the every man for himself body. Unlike the Majority Leader of the Senate, the Speaker has immense sway over the House and can, when necessary, bend it to her will.
With that type of power, it’s not surprising that its leaders have to ward off intra-party threats to their power. In John Barry’s The Ambition and the Power, Barry compares overthrowing a Speaker or Minority Leader to Regicide. And, though unlikely, both sides of the aisle are talking about just such an event.
Pelosi may be forced to, or even want to step down if her party loses the House. Even if the Democrats win, numerous Blue Dogs have intimated in the campaign that they will not vote for her (Heath Schuler claimed that he will run against her if no one else does). Others have talked about electing a whole new House team for the Democrats.
On the Republican side, there has been minor chatter about a Tea Party revolt against Boehner and Eric Cantor. This is extremely unlikely to occur if the Republicans win the House – though it could be possible if they don’t pick up enough seats to take over.
Revolts against the party leaders are not that rare, though these revolts are almost always taking place on the right side of the aisle.