Billionaire conservative casino mogul Sheldon Adelson, who helped keep Newt Gingrich's failed presidential campaign alive during the Republican primaries, is giving $10 million to the super PAC supporting the presumptive GOP nominee, Mitt Romney, according to people with knowledge of the matter.
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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.