A brokered convention is putting the cart before the horse. We still have a long way to go and lots of dust has yet to settle before these questions should be addressed.
From what I read, I think that the Tea Party is focusing on the right areas by targetting the House and Senate. In many respects, that’s where the action is because the POTUS is more a figurehead than absolute leader. The REAL work is done in the House and Senate.
Perhaps, if we controlled both the House and the Senate with large majorities but this President has ignored the Constitution when it suited him and no one has stopped him.