It’s widely agreed that Al Gore, private citizen, has done more to move the global political debate than Al Gore, elected official, ever did. Now Gore, who as vice president supported the Defense of Marriage Act, has put up a video on his Current TV Web site in which he stands up for gay marriage: “Gay men and women ought to have the same rights as heterosexual men and women — to make contracts, to have hospital visiting rights, to join together in marriage, and I don’t understand why it is considered by some people to be a threat to heterosexual marriage…”

Gore’s statement, notes Ben Smith at Politico, “pushes the Democratic establishment that much closer to a position he now shares with Eliot Spitzer and some other leading Dems, and is prompting a bit of grumbling in gay political circles that this batch of candidates aren’t quite there.” He continues:

Gore’s words come after the leading presidential candidates have tiptoed up to, but not crossed, the line of support for same-sex marriage. All three support equal substantive rights for gay and lesbians couples, and they’ve sought to woo gay voters in other ways: Elizabeth Edwards has voiced her support for same-sex marriage, for instance, and Barack Obama recently scolded the black church for homophobia, in a speech to an African-American congregation.

Will Gore’s comments up the ante for the candidates if they want to be seen as sincere?