Now that the primary is over, Obama will move to the center, maybe even to the right. All politicians do this. They go for the hardcore supporters during the primary which means appealing to those more on the edges. Then, during the general election, they move back to the center.
Obama is a centrist liberal, not a progressive. Deal with it. Having said that, IMO, he’s still by far the best of all those who ran in the primaries.