How long until America's first gay president?
I'm betting there already has been, (You didn't say openly gay.)
Theres rumors that Lincolin might have been, but theres no proof as far as I know.
I'm not informed enough to say
who1, but the chances are very good that at least 1 in 45 random people are gay. Sure, the increased scrutiny of public figures may weed out those not sufficiently carefully closeted (when such things are deemed as useful ammunition against them, which so far has been always) but there'll still be a decent chance.
Though I think that the first openly homosexual president (male
or female) is going to happen before the first openly atheistic president (Jefferson, Lincoln or Johnson are the closest so far, it seems). A gay-but-clearly-of-Faith person would be less of a red rag to the red states, as far as I can tell, than one proclaiming themselves as godless. Until the
next big societal upheaval, at least. And it's just IMO, of course, not in any way authoritatively researched.
1 A very cursory look at what information there is brings up our old ranking-bottom friend Buchanan, with information such as "James Buchanan, elected in 1857, was the only unmarried president to stay single his whole life, " a cancelled engagement (that originally theorised as a money/influence-grabbing move on his part, before the break-off) and apparently no further serious female friends (but a commented-upon relationship with the man who was briefly VP to Buchanan's predecessor as POTUS, before his death). - But that's just
looking for 'dirt', and might mean very little. For all we know John Tyler (apparently father of 15 kids by two different wives, possibly at least one more by a slave) was just
very good at covering his proclivities.