With a margin of 2.34%, this election was the second-closest race of the 2018 U.S. Senate election cycle, behind only the Senate election in Florida. Sinema became the first Democrat to win a U.S. Senate seat in Arizona since 1988 when former Democratic Senator Dennis DeConcini last ran for and won reelection to his third and final term in this …

https://en.wikipedia.org/wiki/2018_United_States_Senate_election_in_Arizona