It has long been known that Obama supports partial birth abortion and even opposed the born alive infant protection act, something even naral did not object to. He appointed eugenicists and raging commies as czars in his admin. He is a sociopath. I fail to see how the gay thing should suddenly make him unacceptable to Christians who supported him before. These Pastors are not deep thinkers. All of them that supported Obama are simply morons.
Those first abhorrent policy positions and actions of Obama that you mention are not widely known and the leftist media have not been publicizing them. By contrast, Obama's big gay wedding has been shoved into everyone's faces by the arrogant leftists in the media who are just daring Americans to object. When we get into the voting booths in November we will, each of us, have the opportunity to tell the leftists where to get off. I think Americans will vote a resounding "No!" on all of this mandatory gay nonsense.