Democrats need 60-seat supermajority in Senate to get major bills passed . Before he can get to the general election , Specter will face a tough primary challenge from Rep. Joe Sestak , a former admiral . Sens . Byron Dorgan and Chris Dodd announced This year they wo n't seek re-election . Senate targeting vulnerable seats , including those vacated by Obama and Biden . Flipping could go both ways , with Democrats picking up some GOP seats .
Democrats need 60-seat supermajority in Senate to get major bills passed . Sens . Byron Dorgan and Chris Dodd announced This year they wo n't seek re-election . Senate targeting vulnerable seats , including those vacated by Obama and Biden . Flipping could go both ways , with Democrats picking up some GOP seats .