When President Obama announced his support for gay marriage, supporters and pundits declared it symbolic of a historic shift in American attitudes. But as the attention fades, the fact remains that voters in 31 states have rejected gay marriage and more are lining up to do so.

That leaves opponents of gay marriage to wonder if they're lagging behind history-in-the-making or leading it. Some say that, despite their convictions, they believe marriage between two men or two women will inevitably become law across the U.S. Others say that Obama's announcement strengthens their resolve, and will not slow the drive to protect an institution they consider vital to the nation's survival.