Here's an interesting survey conducted by the Gallup polling organization. According to Gallup, the percentage of U.S. adults who identify as lesbian, gay, bisexual, or transgender (LGBT) ranges from 10% in the District of Columbia to 1.7% in North Dakota. The national average is 3.5%. Of the fives states with highest percentage of LGBT adults (D.C., Hawaii, Vermont, Oregon and Maine), only Oregon has yet to legalize same-sex marriage. Oregonians will have an opportunity next year to change that in a voter referendum.
The states with the lowest percentage of LGBT adults (Utah, Tennessee, Mississippi, Montana, and North Dakota) are deeply conservative and unlikely to let their gay and lesbian citizens marry any time soon.
Most Americans now back same-sex marriage according to recent polls. Personally, I don't like the idea of letting states decide constitutional issues and rights. The U.S. Constitution enshrines certain rights and liberties as so important that they are above the politics of day. Freedom of speech and religion are never put to a vote. Why then the right to marry? The whole point of the U.S. Constitution was to protect the rights of the minority from the bigotries of the majority. Simply put: the right to marry, as protected under Equal Protection clause of the Constitution, should extend to all Americans, gay or straight.