Not at all. A viable LGBT candidate will have to be like Obama in the sense that he credibly engaged in a campaign that was not centered on civil rights. I'm not aware of any potential LGBT candidates for who that is true right now. It's possible that there is an LGBT college student right now could mount a viable campaign for President in 2040. But even that time table would be extremely quick. It is extremely understandable why civil rights is a central theme of any LGBT politician active right now, but Presidential campaigns are not won on the issue of civil rights, so any candidate whose background emphasizes that as their most important quality is not viable regardless of their sexual orientation. You'd need a LGBT candidate who has not made LGBT rights their central focus in politics in order for them to be viable.