It matters much to his constituency if he wants to get elected.
How Buck should have handled it. Something like this.
Buck to the person and/or Democrat operative: Obama should be forthcoming about his eligibility as it matter much to the American public.
Give a statement or two and move to other pressing issues.
Anybody who thinks that headlining the BC issue is anything other than a sure-fire method for joining the whackadoodle gallery really is a dumbass.
It wouldn't be much of a headline but to the numskulls who watch PMSNBC who are the 'whackadoodle gallery' of 'dumbasses' headed by these clowns.
Buck knows that birthers are not a rational crowd, and they're widely understood as being not rational. For Buck even to say something like that would make him a "birther" to the general public, and ruin whatever chance he may have had.
And, to be brutally frank, the issue doesn't matter much to the American public -- it really only matters much to a group of folks who will grasp at any straw to get rid of Obama.