The filibuster isn't the problem (or it isn't completely the problem). There's too many RINOs or Republicans who are just weak. And the President has spent too much time playing nice with people like Teddy Kennedy. Rather than worry about re-election, I'd like to see the Republicans take meaningful steps to limit the size and scope of the federal government.
There are a lot of good conservatives in the House but few in the Senate.
Lots of RINO's though:
Lincoln Chaffee
George Voinovich
Susan Collins
Olympia Snowe
Just to name a few.