Marco Rubio won the Washington, D.C., GOP convention on Saturday night, the city’s Republican Party said.Rubio spokesman Alex Conant quickly tweeted that Rubio’s victory showed that the Florida senator can be a unifier.”DC’s changed a lot in last decade. It’s a minority-majority city that’s embracing the future. And today voted for it,” Conant tweeted.The results came soon after Texas Sen. Ted Cruz picked up nine of the 12 delegates awarded ...