Arizona Democratic U.S. Senate candidate Mark Kelly says he'll vote for Joe Biden in the race for the Democratic nomination for president.
Kelly announced his support for the former vice president on Twitter Monday, ending months of silence on his thinking in the presidential contest.
Kelly is a retired astronaut who has positioned himself as a centrist in what political observers have identified as one of the most hotly contested 2020 Senate races across the country.
Kelly is facing Republican Senator Martha McSally in the November general election.
His endorsement adds to a pile-on of moderate supporters for Biden a day ahead of the crucial Super Tuesday primaries.
Biden is looking to solidify his position as the leading moderate rival to front-runner Senator Bernie Sanders.