Rep. Ruben Gallego (D-AZ) announced his candidacy for the Arizona U.S. Senate seat held by Sen. Kyrsten Sinema (I-AZ) on Monday, emphasizing his commitment to fighting for working families and giving every Arizonan the same chance at the American Dream. Gallego, who is of Mexican descent, has already launched videos in English and Spanish to promote his candidacy and has received endorsements from several prominent Democrats. The Arizona Senate race is expected to be one of the most competitive in the country.