“Iowa’s Tom Harkin, powerful in the Senate and popular back home, said Saturday he will not seek re-election in 2014, creating an open seat in a swing state. Harkin’s announcement follows that of Sen. Jay Rockefeller of West Virginia, who said Jan. 11 he would retire at the end of his term.
Those departures mean that in 2014, Democrats must try to hang onto two open seats in addition to defending 18 incumbents – and seven of the 20 races are in states that voted Republican in the presidential election. The red-state Senators on the 2014 ballot include Mary Landrieu of Louisiana, Mark Begich of Alaska, Max Baucus of Montana, Tim Johnson of South Dakota, Mark Pryor of Arkansas and Kay Hagan of North Carolina.
Republicans will have 13 senators up for re-election, all but one – Susan Collins of Maine — from red states.