DETROIT — Supporters of Kristina Karamo struck back Saturday, voting overwhelmingly to keep her as the Michigan Republican Party’s leader and to ban some of her most vocal critics from being affiliated with the party for five years. The votes, which took place at a banquet center in Houghton Lake amid snowy weather outside, marked a win for Karamo, a former secretary of state nominee whose term as party chairwoman has been rocked by financial struggles and internal divisions. Seven days earlier, at a meeting organized by opponents of Karamo, a different group of Republican state committee memb…