For the life of me, I will never understand why a small group of progressives thinks that, by pointing out every Democrat's faults, they are somehow "holding politicians accountable." But what really bothers me is that so much of this "holding them accountable" is actually hurting us in the long run.
We live in a democratic republic. What that means is, we elect representatives to act as our proxy in the government. Because of the way our government is designed, no politician has very much power at all, and can't do much of anything. That includes the president. The government works as a body, not as 536 individuals. There are a series of checks and balances in place, to keep everyone in check. Harry Reid cannot just decide to change filibuster rules. Nancy Pelosi cannot just insert the "public option" into a bill and pass it because you demand that she does so. President Obama cannot simply close the prison at Guantanamo Bay because he promised.
A politician's list of "campaign promises" are generally little more than a wish list of things he or she would like to get done, if they can persuade a majority to go along with them, and the president can be persuaded to sign. As they govern, they make deals and they cajole and they twist arms, in order to get as many things as possible for their district or state.