Total Seats in Play
| Democrat: 21 Republican: 14 |
Pure Toss-up
| Democrat: 1 Republican: 0 |
| SD | II | D | | Johnson | |
Toss-up/Tilt Democrat
| Democrat: 2 Republican: 0 |
| AR | II | D | | Pryor | |
| LA | II | D | | Landrieu | |
Lean Democrat
| Democrat: 4 Republican: 0 |
| AK | II | D | | Begich | |
| IA | II | D | Open | Harkin | |
| MT | II | D | | Baucus | |
| NC | II | D | | Hagan | |
Democrat Favored
| Democrat: 1 Republican: 0 |
| NH | II | D | | Shaheen | |
Currently Safe Democrat
| Democrat: 12 Republican: 0 |
| CO | II | D | | M. Udall | |
| DE | II | D | | Coons | |
| HI | III | D | | Schatz | |
| IL | II | D | | Durbin | |
| MA | II | D | Open | Cowan Special | |
| MI | II | D | Open | Levin | |
| MN | II | D | | Franken | |
| NJ | II | D | Open | Lautenberg | |
| NM | II | D | | T. Udall | |
| OR | II | D | | Merkley | |
| RI | II | D | | Reed | |
| VA | II | D | | Warner | |
Toss-up/Tilt Republican
| Democrat: 1 Republican: 0 |
| WV | II | D | Open | Rockefeller | |
Lean Republican
| Democrat: 0 Republican: 0 |
Republican Favored
| Democrat: 0 Republican: 2 |
| KY | II | R | | McConnell | |
| ME | II | R | | Collins | |
Currently Safe Republican
| Democrat: 0 Republican: 12 |
| AL | II | R | | Sessions | |
| GA | II | R | Open | Chambliss | |
| ID | II | R | | Risch | |
| KS | II | R | | Roberts | |
| MS | II | R | | Cochran | |
| NE | II | R | Open | Johanns | |
| OK | II | R | | Inhofe | |
| SC | II | R | | Graham | |
| SC | III | R | | Scott | |
| TN | II | R | | Alexander | |
| TX | II | R | | Cornyn | |
| WY | II | R | | Enzi | |
Senate Outlook
Democrats have a 55-45 majority. Republicans need to gain 6 seats for a majority. At this early stage, GOP gains seem to be inevitable but the size is still in doubt.
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