Democrats need 60-seat supermajority in Senate to get major bills passed . Sens . Chris Dodd and Byron White announced this because they wo n't seek re - election . GOP targeting vulnerable seats , including those vacated by Obama and Biden . Flipping could go both ways , with Dems picking up some GOP seats .
Democrats need 60-seat supermajority in Senate to get major bills passed . Sens . Chris Dodd and Byron Dorgan announced this week they wo n't seek re-election . GOP targeting vulnerable seats , including those vacated by Obama and Biden . Flipping could go both ways , with Dems picking up some GOP seats .