Obama opposed gay marriage as well. As did many prominent politicians, left and right.

The swing from opposing it to supporting it was a huge cultural shift, and I'm not sure I've seen anything like that happen so quickly, except maybe during a time of war. It went from being opposed by a strong majority to supported by a strong majority in... maybe 5-8 years? It was pretty impressive, and I think it's a sign that the marketplace of ideas can still function.

It helps a lot that it's really a harmless thing. It's giving people more freedom, not taking any away from anyone, and so as soon as it became clear that it wasn't causing a problem, everybody shrugged and went 'ok'.

Supporting one of two candidates in a first past the post election is simply supporting the lesser evil. There is no other information to glean.