U.S. Senate36 out of the Senate’s 100 seats are up for election.
What’s at stake Democrats currently have a majority in the Senate, with 55 seats. Republicans can take control by winning 21 races in this election.
Wild card Greg Orman, the independent candidate in Kansas, hasn’t declared which party he will caucus with and could get to decide who holds the majority.
Ties in the Senate are broken by Vice President Joe Biden, a Democrat. Two independents, Sens. Bernie Sanders (Vt.) and Angus King (Maine), caucus with Democrats.
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If no candidate gets more than 50 percent of the votes, the top two candidates will move on to a runoff on Jan. 6.
This election is an “open primary.” If no candidate gets more than 50 percent of the votes, the top two candidates will move on to a runoff on Dec. 6.