The Republican mayor of Mesa, Arizona, made the case Monday for why other Republicans should back Vice President Kamala Harris’s bid for the White House. During a speech introducing himself as the co-chairman of Arizona Republicans for Harris, John Giles spoke in blunt terms about former President Donald Trump, whom his party nominated last month for the presidency for the third time. “I think the time has come for us as Arizona Republicans to admit the obvious and to start saying the quiet part out loud,” Giles said. “Our party’s nominee is not qualified for office and… we need to vote for …