He didn't block it, even if he advocated against them, it wasn't in his power to make the final decision.

Regardless, it makes no sense to punish Obama when the results of such a move are more far reaching.  It punishes the states who followed the rules and didn't move their dates forward, it punishes the voters in MI and FL who would have voted differently, it punishes the rest of the country by messing with the results of their election with an invalid uncontested vote.

You look at the big picture, and you realize it just isn't something you can do.  It isn't a game of football where we give Hillary a 15 yard advance because Obama did something wrong, the ramifications are real and far reaching.