Originally Posted by Michael1

... if being successful and cheating on your wife multiple times means your endorsement is meaningless, should we assume you will equally not care when Bill Clinton eventually gets around to endorsing Obama ... or that Ted Kennedy already has???

The real story isn't that Trump endorsed Obama. The story is that he was a very pro-Hillary proponent and because of the way Obama stole the nomination and then proceeded to thumb his nose at Hillary when it came time to choose a VP, he has defected from the Dems and prefers McCain.