DES MOINES — Gubernatorial challenger Jack Hatch thinks Iowa Republicans will target same-sex marriage if they gain complete control of state government in the November elections.During their weekly news conferences, Gov. Terry Branstad and Hatch were asked about same-sex marriage as a campaign issue.Branstad said it is not an issue he is focused on as governor, because it is an issue that would have to be addressed by the Legislature.Since the Iowa Supreme Court in 2009 ruled the state law banning same-sex marriage unconstitutional, a new ban would require amending the state Constitution.