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These are the 13 races that will determine control of the Senate in the next Congress. To win control, Democrats would need to net-gain four seats, or three seats plus control of the White House.
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Five Republican Senate incumbents are looking increasingly vulnerable, while fundraising reports provide glimpses of Democratic strength.
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The Arizona Republican said she did not report the assault because "I didn't trust the system at the time." The revelation came during a hearing on sexual assault in the military.
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The decision comes after Republican Sen. Jon Kyl, who had been a temporary replacement after John McCain's death in August, announced last week he would step down at the end of the year.
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Sinema is the first woman Arizona has elected to the Senate ever, and the first Democrat the state elected to the chamber in 30 years. She'll make history as the first openly bisexual senator.