Well, if you examine the margins on defeat of gay marriage bills over the past 30 years, they've gone from universal staggering defeats to barely scrimping by. Prop 8 was passed with a mere 4.2%.Not that many on the left don't claim if you don't agree with their social policy you are "ignorant" or aren't "tolerant" enough.
Same-Sex Marriage: As Hawaii Goes . . .On November 3rd , voters in Hawaii vote 69% to 28% to amend the state’s constitution to empower the legislature to reserve marriage to opposite sex couples. This vote nullifies any positive ruling by the Hawaii Supreme court, effectively allowing the state legislature to ban same-gender marriage.
And yet the state has virtually no problems with a civil union status that is for all intensive purposes, separate but equal.
Given the decreasing margins of victory for the anti-gay marriage group, it's only a matter of time.