It's politicians in general. They are all to one degree or another power hungry crooks, Democrats and Republicans.

That's precisely why the federal government needs to be smaller and more limited in power which is the purpose of the Constitution.

Obama however see's the Constitution as a document (these are his own words) of "negative liberties" for the government.

Centralized power beyond the limits of the Constitution is a very dangerous thing and that's exactly what our current crop of politicians are all about. Power and control. And, we are willingly turning it over to them.