Strange. I know a lot of people who are supportive of gay marriage, but not gay adoption. But the other way around it's kind of rare. Mitt Romney is really something. 
That's one of the most striking differences between the US and Europe, actually... you will find a
lot more people over here in favor of gay adoption than gay marriage.
Honestly, I can't fathom the reverse. I'd even go further than Marokai: it doesn't matter who raises you, whether a single person or a boatload, as long as (1) the people raising you aren't abusive and (2) you can form a relatively stable social network with peers.
