I can campaign for middle class tax cuts and demagogue my opponents for trying to raise them...while I raise them.
I can constantly use raising taxes on the rich as a wedge issue without doing anything about it for years.
I can say I support the individual right to bear arms while refusing to defend that position or even state one at all in a landmark court case.
I can run on and promise to close the military prison at Guantanamo Bay, sign an order to do so, then just not do it.
I can campaign against the evils of war and civil rights abuses of my predecessor, while doing worse on literally every single issue.
I can pass "emergency" programs that phase in spending over four years.
I can promise to ban lobbyists from my office, then hire them by the dozens.
I can make wildly inaccurate predictions that if we pass said "emergency" program that the unemployment rate will be 7.5% after a year (it was ~10%) and 5% after four years (it's still 7.7%), but it will end up even higher than I predicted it would be without the program, and people will just make excuses for me.
I can enforce a law while simultaneously deciding it's unconstitutional and refusing to defend it in court.
I can promise that my fancy new health insurance reform will lower premiums, then watch them go up.
I can smoke marijuana in college, promise to have a more compassionate policy toward it later, then keep using my office to oppress and bully people over it even in places where it's legal.
I can be hailed as a civil rights hero for holding the exact same position that Dick Cheney did three years before.
I can say that I don't have the power to do something, then do it anyway.All this because I'm a Democrat! Because no one would ever let a Republican get away with it. This is the life!