If history holds true, which is likely considering 2009 is shaping up to be a good GOP year and this will fire up conservatives in Maine, then this ends gay "marriage" in Maine. Vote yes on 1.
Level of GOP support ≠ Level of support for marriage inequality. Repeat that as many times as necessary until you understand it.
And, as Al said, you obviously don't understand what history is.
You're absolutely right, GOP support and support FOR marriage are inequal, support FOR marriage is almost always greater than GOP support because minority voters vote how they feel on the issue rather than falling for left wing race baiting. McCain lost in Florida and California but marriage won and marriage won BIGGER than McCain did in Arizona.
If your counting on minorities in Maine to pass this, you will be disappointed.