Are oil refineries price fixing

Some democrats have said that oil refineries might be price fixing.

http://hamptonroads.com/node/600234

Is Exxon Mobile and others using speculators as scapegoats to keep attention away from their price fixing?

Most likely. Very common in oligopolies.

I think there's been price fixing for a long time now. No one is willing to do anything about it, not even Democrats, they have other things to worry about.

Politicians only care about pushing their agenda, which means they have no desire to do things right. They only care about pushing their agenda. They could care less what else happens.