In the wake of Ohio Republican Sen. Rob Portman’s  announcement that his son is gay, and his son’s coming out prompting  the senator to support gay marriage, it has become  commonplace to assert that Republicans are about to flip-flop on the gay marriage issue. Activists on both sides seem to agree. The Log Cabin Republicans triumphantly declared: “If there was any doubt that the conservative logjam on the issue of civil marriage for committed gay and lesbian couples has broken, Senator Portman’s support for the freedom to marry has erased it.” On Sunday, Karl Rove appeared to take leave of his senses when he said he could imagine the 2016 Republican presidential nominee supporting legal same-sex marriage. And with the Supreme Court set to hear a challenge to gay marriage bans this week, many observers are predicting that one or more conservative justices will join with the Court’s liberal wing to overturn the Defense of Marriage Act, and possibly California’s Proposition 8 as well.