Eyeballing North Dakota as a state I'd guess that support for gay marriage is probably somewhere around a third or slightly more than a third, gay marriage plus civil unions somewhere in the very high thirties or low-to-mid forties (I might be lowballing that; you obviously know more about North Dakota than I do, since you're from there).
I don't think so. (Compare to Utah).
That was enough time ago that I don't think assuming a 7-10 point swing in attitudes is unreasonable. Remember that in 2004 gay marriage nationwide was polling for the most part well under forty per cent.
Even a 7-10 point swing still gets you to barely a third even supporting civil unions, and it must be remembered that there's a very large "Bradley effect" with gay marriage polling (see; Prop 8 and Maine).
