My problem is with the insinuation you made that he may be gay and that his marriage and wife may be a "cover". I just think that kind of stuff is what makes political dialogue in this country so debased.
Challenge him all you want on his pro bono work, I think he needs to answer questions like that, but the whole "Is he gay?" thing is clumsy at best and mean spirited at worst.
It is more than possible that he is not gay. But I don't think it is "mean-spirited" to inquire. I think it is important if anyone in a position of power has an agenda to overturn all traditional morality to accommodate his or her favorite perversion.