The evidence comes from Maya's very public blog (first discovered by Modern Vertebrate). Xanga apparently allows parts of the site to be "protected" from those not on a special list, but Xanga has poor technology, as some of that protected content can be easily found. For example, here's the post where she hides parts of her site.
If this is a hoax, and it very well could be, it's a pretty good one.
And if it's real, don't worry, Maya still thinks abortion is like lynching. Being queer, and wearing a "George W. Bush: You're Fired" button doesn't disqualify wingnuttery on other issues.
Update: I took down the picture to make the post a little less inflamatory.
But really, neither I, nor other blogs, have "outed" Maya. She's out. She brags about wearing her rainbow bracelet on the campaign trail. Her father must either be blind or clueless not to know his daughter's sexual preferences. Pointing out that the adult daughter of a politician, who is campaigning with that politician is gay isn't a slur.
So why is Keyes so quick to attack the children of others? Why is he so virulently anti-homosexual? Why does it seem that every high-profile anti-gay figure has a gay child?
From reading her blog, it seems like Maya is out and proud. Good for her. The question is, what kind of person is her father, to so hatefully oppose something that's so innately part of Maya?