It's generally agreed that President Obama never would have seen the political necessity to restate (and revise) his position on same sex marriage if Vice President Joe Biden hadn't said on "Meet the Press" that he was "absolutely comfortable" with the idea. And despite the President getting virtually universal positive coverage for his support of the idea, this apparently didn't sit well inside the White House. In fact, the New York Times is reporting that Vice President Biden may have had to apologize to the President for forcing him to make his shift in position public:
A few hours before President Obama offered his historic endorsement of same-sex marriage on Wednesday, Vice President Joseph R. Biden Jr. apologized to the president in the Oval Office for forcing Mr. Obama’s hand by airing his own views three days earlier, several people briefed on the exchange said on Thursday.[...]
Mr. Biden has said nothing publicly since his remarks on the NBC program “Meet the Press.” But he has told staff members at the White House that he regrets putting the president in an awkward spot, several officials said. These officials declined to characterize his precise remarks to Mr. Obama, or Mr. Obama’s response.
The White House had planned for the president to endorse same-sex marriage as soon as next Monday, when he was scheduled to give an interview to the ABC program “The View.” Instead, in the wake of Mr. Biden’s interview, the president’s aides hastily scheduled an interview Wednesday with Robin Roberts of ABC News.
It's not as though this is the first time a Biden gaffe has heard the White House. Still, it's intriguing that the President might have planned to do this anyway, and that Biden's honesty only pushed him back a few days. Yet one more piece of evidence that the President's position really wasn't "evolving" at all.