A group of Mexican senators is backing a “Tell Them To Vote” campaign that encourages Mexicans to urge relatives living in the U.S. to vote in the November election. Sen. Gabriela Cuevas says she will push for the full Senate to back the campaign, which includes videos that call on Mexican-Americans in the U.S. to register to vote. Speaking Tuesday, Cuevas said that “I think this is something that can unify all the political parties.” …