Juan Williams, The HillWith the surprise announcement of Sen. Tom Harkin's (D-Iowa) retirement, the Senate is fast closing the book on post-Watergate politics that produced a generation of liberal Democrats.Harkin's announcement came the same week that five-term Massachusetts Senator John Kerry left the body to become secretary of State. Earlier this month, another Senate five-termer, West Virginia Senator Jay Rockefeller, said he doesn't plan to run for re-election in 2014. Last month, 8-term Sen. Daniel Inouye of Hawaii died. ... Read More