Why are we electing "misrepresentatives"?

Ol' Remus opines:

They're doing it again. The moribund Progressives-Lite are warning of lost seats in Congress if tea party activists won't support Republican candidates. You know the drill, "the perfect is the enemy of the good," they say. "We all have to compromise," they say. No, we don't. Compromise is sometimes part of governance, but never part of principle. When a candidate compromises on principle, especially before they're elected, the voter can't know who he represents. Almost certainly not the voter. The idea is stunningly simple: if a candidate doesn't represent the voter, the voter shouldn't support the candidate...