Likely presidential candidate had previously seen GOP reducing focus on issue.If presidential candidate Sen. Ted Cruz (R-Texas) tries to push forward a constitutional amendment guaranteeing state control over marriage laws, he'd have support from at least one potential rival. While speaking in Iowa over the weekend, Republican Wisconsin Gov. Scott Walker made it clear that he, like Cruz (and Sens. Rand Paul and Marco Rubio) thinks states should have the authority to decide whether to recognize same-sex marriages. In front of a crowd in Waukee, Iowa, he said: "I still hold out hope that the Supreme Court will rule, as...