Factbox: Democrats threaten Senate's Republican majority in key races

Democrats would need to win at least three Republican-held seats for a majority, if Democrat Joe Biden wins the White House, giving his running mate Kamala Harris a tie-breaking Senate vote, or four seats if Biden loses. Republican Senator Martha McSally lags Democratic challenger Mark Kelly in fundraising and trails him by an average of just over 11 percentage points in opinion polls, according to the campaign tracking website RealClearPolitics.com.

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