It has been a week since the massacre in Aurora, Colorado. The two major U.S. presidential candidates spent the past week avoiding the subject of whether anything should be done to prevent such shootings from recurring.
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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.