Rick Santorum, Jesse Helms, Strom Thurmond, Jim Bunning, Ted Stevens, James Inhofe, Jim DeMint.
Bachmann, like Bob Dornan before her, is a sideshow. Sure she's crazy, but outside her vote (which is a given) she's got no power. You can ignore her and all the other flamboyant nutbars, and that leaves you with a deliberative body that's just as capable as figuring shit out as the Senate, only without the completely insane institutional veto-points and representative distortion.
We have the Senate because the founding fathers all grew up with the House of Lords and wound up copying the idea. It's dumber now than it was then, because of the huge population differences between states and the acceptance of the non-filibuster filibuster.