In July 2009, Mitt Romney called on President Obama to require Americans to buy insurance as part of his health care plan, using "tax penalties" as a backstop - in other words, the individual mandate that Republicans virulently oppose.
33 out of 100 seats are up for election. 51 are needed for a majority.
|Seats gained or lost||+2||-2|
* Includes two independent senators expected to caucus with the Democrats: Angus King (Maine) and Sen. Bernie Sanders (Vt.).
All 435 seats are up for election. 218 are needed for a majority.