Should gay marriage remain State decided?

With President Obama becoming the first U.S. president to openly support gay marriage (even if it is only because Biden forced him to do it by doing it first), it brings to topic the question on who should continue to determine the rights for same sex unions.

Based on the current events, if it were up to the White House, same sex unions would be legal. However it currently stands with the individual states.

North Carolina lawmakers exercised their right to choose and voted against same sex unions. Just the same, states like Vermont allow it. You win some, you lose some.

Do you think this power should stay with the individual states or should the White House have absolute say on the issue?