This was an historic week in U.S. political history. No Democrat can now seriously run for president, and survive a primary, without supporting gay marriage. Why? Ohio Sen. Rob PortmanRobert (Rob) Jones PortmanSenate moving ahead with border bill, despite Trump 13 GOP senators ask administration to pause separation of immigrant families Lawmakers, businesses await guidance on tax law MORE, a conservative Republican, came out in favor of same-sex marriage, followed immediately by a video announcement from Hillary ClintonHillary Diane Rodham ClintonHouse Judiciary Committee subpoenas FBI agent who sent anti-Trump texts Clapper: Trump was serious when he said he wants citizens to act like North Koreans do for Kim Hillary Clinton: Fundamental rights are 'under assault like never before' MORE (why wait for an interview?) declaring her support for the same. Then an ABC News/Washington Post poll released Monday showed that an all-time high of 58 percent of the country now supports same-sex marriage, up an astonishing 26 percent in just nine years.

The issue is now a litmus test in Democratic presidential politics, the exact opposite from 2008, the last open election, when no Democrat seeking the Oval Office would dare sanction marriage for anyone but one man and one woman for fear of tainting themselves for the general election. On this issue, most of the general election will now be behind them. Not so for Republicans, who would struggle in a GOP presidential primary among evangelical Christians who have enormous influence in the primary process. Their support may be an insurmountable hurdle. David Brody of the Christian Broadcasting Network questioned this week whether the GOP would lose evangelicals by remaining silent on the issue of gay marriage.

Clinton's announcement was clearly on its way, with her husband less than subtly laying the groundwork two weeks ago with his declaration of regret over signing the Defense of Marriage Act. After all, two gay-marriage cases reach the U.S. Supreme Court next week, and Clinton thought it the perfect time to announce her support in advance. But there's a pretty good chance she rushed out her video as soon as Portman's surprise announcement just days before. No matter what, it means Clinton doesn't want the 2016 presidential speculation to leave her out.

Just sayin'.

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