Obama won't say whether he'll push Congress to act on gay marriage President Obama declined to say in an interview airing Tuesday whether he would push for the repeal of the Defense of Marriage Act. During an appearance on ABC's "The View" taped Monday, Obama said his administration views DOMA as unconstitutional, but came up shy of saying it should be repealed. "Congress is clearly on notice that I think it's a bad idea," said Obama, who last week endorsed gay marriage for the first time. The Justice Department has served notice that it will no longer enforce DOMA, which would prevent states from marrying gay and lesbian couples. But as long as the law is on the books, it could conceivably be enforced by future administrations to outlaw gay marriage. Obama has said he think the issue is a state issue. Also of note from the interview: While Mitt Romney has largely declined to make an issue of Obama's shift in favor of gay marriage, Obama said he intends to talk about it plenty in the run-up to November's election. "This is going to be a big contrast in the campaign, because you've got Gov. Romney saying we should actually have a constitutional amendment installing the notion that you can't have same-sex marriages," Obama said in the interview, according to ABC News. The full interview airs Tuesday at 11 a.m. Eastern.