The League of Conservation Voters will launch a $1.5 million campaign Tuesday targeting five House Republicans who question the connection between human activity and climate change, in an effort to test whether the issue can sway voters.
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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.