This story has been updated.

President Obama is likely to clarify his views on same-sex marriage Wednesday in an interview with ABC’s Robin Roberts. The interview is scheduled to be taped Wednesday afternoon, with the network planning to air portions of it later in the day.

View Photo Gallery: President Obama has come under pressure to take a stronger position on the issue of same-sex marriage in recent weeks. View our best photos from the campaign trail.

The president has been under intense pressure for his self-described “evolving” position on the issue since Sunday, when NBC aired an interview in which Vice President Biden said he was “absolutely comfortable” with gay marriage.

Biden’s comments put Obama on the spot, exposing the president’s position to ridicule among gay-rights activists who see it as a wink-and-nod stance to avoid alienating conservative swing voters as well as African-Americans and Latinos key to Obama’s reelection.

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The president’s challenge was evident in Tuesday’s vote in North Carolina, one of the campaign’s targeted states, where voters overwhelmingly backed a constitutional amendment to ban same-sex unions.

Obama’s campaign released a statement describing the North Carolina results as “disappointing.”

Aides to the president would not say what Obama might tell Roberts today about the issue of marriage.

An Obama policy shift today would follow days of frantic phone calls and conversations between campaign officials and leading activists and donors in the lesbian, gay, bisexual and transgender community.

Speculation Wednesday focused on how far Obama might be willing to go, particularly given concern among some advisers that a full embrace of same-sex marriage could help stoke conservatives and give presumptive Republican n nominee Mitt Romney a way to consolidate support in a GOP base that remains uneasy about the former Massachusetts governor.

But the calculation has shifted since the Biden remarks put a harsher light on Obama’s efforts to navigate the issue. Suddenly, a president who hoped to portray himself as a confident and steady decision-maker — while painting Romney as a serial flip-flopper – risked looking weak and indecisive.

If Obama shifts, it will reflect a prevailing view on his team that the political risk of alienating anti-gay marriage voters was now superceded by the danger of tainting his image as a strong leader.

His evolving views have moved in both directions over time. As a state senate candidate, he once endorsed gay marriage on a questionnaire, then as a presidential candidate he opposed gay marriage. As president, he has pursued a largely pro-gay rights agenda, repealing the military’s “Don’t Ask Don’t Tell” policy and declining to argue in court for the Defense of Marriage Act.

“My feelings about this are constantly evolving,” he said in 2010. “I struggle with this. I have friends, I have people who work for me who are in powerful, strong, long-lasting gay or lesbian unions. And they are extraordinary people. And this is something that means a lot to them and they care deeply about.”

But gay supporters grew angry Sunday after Obama aides tried to tamp down excitement over Biden’s comments and dismiss any suggestion that the vice president’s views differed from those of the president.

At least one in six Obama bundlers are gay, according to a Washington Post count, making it hard for the president to ignore the growing frustrations.

Romney reiterated his opposition to same-sex marriage in an interview in Fort Lupton, Colo. Wednesday, but declined to comment on Obama’s evolving position on gay marriage.

When reporters asked him following a campaign event in the Denver area for his views on the president and his administration’s positions on same-sex marriage, Romney would not comment other than to say, “Not on the ropeline.”

Earlier Wednesday, in an interview with local Fox affiliate KDVR-TV, Romney said he favors some rights accorded by civil unions but not marriage. Asked about a state civil unions measure failing in the Colorado state legislature on Tuesday, Romney noted that similar issues were raised in Massachusetts during his term as governor.

“I indicated my view, which is I do not favor marriage between people of the same gender, and I do not favor civil unions if they are identical to marriage other than by name,” Romney told KDVR-TV. “My view is the domestic partnership benefits, hospital visitation rights, and the like are appropriate but that the others are not.”

The White House’s attempt to downplay Biden’s remarks and stand by Obama’ “evolving” position marked the second point of tension between the president and his LGBT allies in as many months.

In April, activists were outraged when Obama aides announced the president had no plans to sign an executive order prohibiting federal contractors from discriminating on the basis of sexual orientation or gender identity. Officials said they wanted to focus, instead on passing federal legislation, instead – but advocates viewed the position as a dodge, given the unlikelihood that the Republican-led House would consider the measure.

The executive order announcement drew surprising rebukes from some of the White House’s closest LGBT allies, including those at the Center for American Progress and the Human Rights Campaign who have generally defended the administration’s record on gay rights.

In addition, LGBT donors began pressuring the Obama campaign and the White House to reconsider. One major Democratic giver, Jonathan Lewis, indicated the failure to sign the order has resulted in several givers opting not to donate to the pro-Obama super-PAC, Priorities USA, according to The Post’s Greg Sargent..

An adviser to another major LGBT donor said Wednesday that the dual effect of the White House response to Biden’s comments and the executive order meant more donors withholding help, unless Obama shifted on one or both of those issues.

“The top 12 gay and lesbian donor sin this country have all maxed out to the president, but they have not played in the super PAC world yet,” this adviser said. “And if there is the expectation that they’re going to, then there will have to be some concrete actions in fairly short order to demonstrate this administration’s desire to keep them included in this campaign.”

The dynamic – and Obama’s decision to sit for the interview Wednesday – underscored how much of president can ill afford to alienate any piece of his base in what is expected to be a tight election.

Another LGBT advocate familiar with White House and campaign deliberations said Wednesday the Biden comments spurred a renewed debate among Obama’s top policy and political advisers about what they could to satisfy this core constituency. That conversation included marriage and the executive order.

“The conversation is, what can and should we do to quiet the uproar and to get donors back on board,” the advocate said.

Staff writer Philip Rucker contributed to this report.

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