There are currently 257 seats held by the Democrats and 178 seats by the Republicans in the House of Representatives. All seats are up for election for the 50 states as they only have 2 year terms.
Senators have 6 year terms and election is staggered every two years for one-third of them--these are up for re-election:
|NH||Judd Gregg||R||Likely retiring|
|NV||Harry Reid||D||Running for reelection|
|NY||Chuck Schumer||D||Running for reelection|