| These 34 races worry me more than who gets the top spot. |
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| Party | State | Incumbent |
| Democrat | CA | Barbara Boxer (not running) |
| Democrat | CO | Michael Bennet |
| Democrat | CT | Richard Blumenthal |
| Democrat | HI | Brian Schatz |
| Democrat | MD | Barbara Mikulski |
| Democrat | NV | Harry Reid (not running) |
| Democrat | NY | Chuck Schumer |
| Democrat | OR | Ron Wyden |
| Democrat | VT | Patrick Leahy |
| Democrat | WA | Patty Murray |
| Republican | AL | Richard Shelby |
| Republican | AK | Lisa Murkowski |
| Republican | AZ | John McCain |
| Republican | AR | John Boozman |
| Republican | FL | Marco Rubio |
| Republican | GA | Johnny Isakson |
| Republican | ID | Mike Crapo |
| Republican | IL | Mark Kirk |
| Republican | IN | Dan Coats (not running) |
| Republican | IA | Chuck Grassley |
| Republican | KS | Jerry Moran |
| Republican | KY | Rand Paul |
| Republican | LA | David Vitter |
| Republican | MO | Roy Blunt |
| Republican | NH | Kelly Ayotte |
| Republican | NC | Richard Burr |
| Republican | ND | John Hoeven |
| Republican | OH | Rob Portman |
| Republican | OK | James Lankford |
| Republican | PA | Pat Toomey |
| Republican | SC | Tim Scott |
| Republican | SD | John Thune |
| Republican | UT | Mike Lee |
| Republican | WI | Ron Johnson |
Barbara Mikulski (D-MD), and David Vitter (R-LA) are not running either.