10 Senate Seats Most Likely to Flip

After struggling for two consecutive cycles on the Senate battlefield, Republicans seem poised to make a comeback in 2010.

With 37 seats up for grabs — and Democrats defending 19 of them — the GOP is flexing its muscles in Democratic-leaning states like Delaware, Connecticut and Illinois. Recruiting coups by National Republican Senatorial Committee Chairman John Cornyn of Texas are one big reason Republicans feel a new sense of confidence. Democrats, meanwhile, are taking on an increasingly defensive crouch as the party in power, which must defend President Barack Obama’s ambitious — and expensive — agenda.