Bisexual IS homosexual. Andrew Dice Clay had this subject right. This is purely semantics. They’ll pave the way for polygamy in the name of love and tolerance.
I still think this open declaration on Obama’s part may have set him back in the culture wars, and may cost him the election.
Homosexuals conceitedly believe there is no distinction, that a bisexual is just someone unwilling to accept their own homosexuality but those who identify as bisexuals argue they are attracted to individuals without regard to gender.
The Prop 8 federal court ruling that invalidated CA's traditional marriage constitutional amendment did not address number at all but described gender restriction in marriage as arbitrary.
For me, number seems at least as arbitrary as gender so it'll be interesting to see how "marriage" avoids being opened to polyamory/polygamy.