Bear with me, I happen to have watched way too many demographics videos lately:

The US is actually a darn big place and it's not hard to carve out a homestead or thousand for yourselves. All that's necessary to become the majority cultural/political force, in the long term, is to out-breed the Amish... for queer (modulo bi) values of "out-breed". May I suggest funding communes at the arse-end of nowhere (the cities are blue already, anyway) and adopt around 10 children per half-couple (polys need more complicated maths). If anyone objects, just call it a religion. The number is that high (Amish have an average of 7 births per woman) because few of those will actually turn out to be queer thus the community attrition rate will be high, OTOH you'll get reinforced by refugees (incl. ex-Amish) and the people leaving are very unlikely to be queer-phobic, constituting something of a vanguard for queer acceptance in other areas. Also I didn't do any maths you probably should be more thorough.