Lincoln was gay. Or, more probably, he wasn't, but he's not around to defend himself, so his personal history is vulnerable to any asshole with an agenda.
Regarding the idea that Lincoln didn't get along with Mary Todd because he was gay, please remember that SHE WAS NUTS. You don't have to be gay not to get along with a spouse who's out of his/her mind.
Now they've bought the ring and scheduled a romantic candlelight dinner: Pedro Martinez rumored to be going to Mets. Mike Piazza makes frantic last minute call to Fruit-of-the-Month club in anticipation of next year, increases list of teams to which he will accept a trade to "Anywhere but here."