Get rid of all incumbants and rats.
Spoken as someone who truly does not understand the system at all. Each elected official in Congress has dozens of paid aides. If an incumbant loses his seat, guess what? The old aides become the new aides. Congress cannot become "fresh" by voting out incumbants, it can't become "fresh" at all due to the sheer size and volume of the rules and procedures. Aides are needed to guide Congressmen and Senators through the maze of protocols and issues, and only through experience serving in Congress does the reliance upon those un-elected rulers become lessened.
Throw out the incumbants! Term limit Congress and the Senate!
With that battle cry you give the reins of power to the un-elected rulers of D.C. and make elected officials figureheads of our government.
Our goal should be to make sure that there are more liberal (i.e. Democratic) aides working at Starbucks waiting for the next election cycle than there are conservative (i.e. Republican) aides doing so. If you don't believe this is the truth, then you do not understand Washington, D.C.