[img]http://d.yimg.com/a/p/ap/20100215/capt.32e1609f82a549bb9806a89258c7f725.senate_bayh_retires_inam104.jpg?x=130&y=88&q=85&sig=3MiPgAT2MS.6HzZLyC9W.w--[/img]AP - The moderate middle is disappearing from Congress. Evan Bayh is just the latest senator to forgo a re-election bid, joining a growing line of pragmatic, find-a-way politicians who are abandoning Washington. Still here: ever-more-polarized colleagues locked in gridlock — exactly what voters say they don't like about politics in the nation's capital.