Luckily, at least in California's case, it's quite obvious that all that's needed to change the constitution is a 50% vote. So, I expect that prop 8 will get flipped over in a couple years.
However, the campaign for 8 was truly despicable and omnipresent. I saw ads for it plastered over just about every website I went to, including this one (I blame adsense or whatever, not you, Jake et al), and the ads were completely full of bullshit. One thing about the people backing the proposition is that they don't really have to be honest about anything and they'll do whatever it takes to win, so they resorted to blatant scare tactics, including saying that we'd be teaching gay marriage in schools, which is ridiculous on multiple levels.