Reps only need a net of 3 seats. Considering the anti-incumbent sentiment consider this.
Democrat/independent senators up for re-election = 15
Democrats retiring because they know they will lose =6
Republicans up for re-election= 6
republicans that are retiring or lost the primary=4 including RINOS snowe, lugar ,hutchison
When you consider the teaparty has begun the housecleaning by sweeping out Snowe and Lugar you really have to see hope for a net 3 pickup.