What Digby Said

More solid advice from Digby on the enthusiasm gap and what to do about it (emphasis mine):

Many people believe that the only thing Democrats understand is pain and so the thing that will change this dynamic will be to deliver them a loss of their majority and perhaps the presidency to show the consequences of failure to fulfill the progressive agenda. That certainly sounds right, except you can't ever know exactly what lesson will be taken from this sort of pain and if history is any guide, the likeliest one is the simplest and most obvious: they lost because people preferred what the other side had to offer. Obviously, that's not necessarily the case, but it isn't illogical for them to believe that. And the exit polls or whatever other data may be available rarely clearly show that it was base demobilization that caused a turnover. Often people don't even know why they failed to vote and you can't exit poll those who didn't bother.

This right here is a major issue:  Nobody exit polls people who don't vote on why they didn't vote at all.  She continues:

There is a fairly compelling theory in political science that says that after political parties come into power, fulfill some pieces of their agenda, get fat and bloated and are finally removed from office, they then tend to deny the reality of their loss and blame it on everything but themselves until they lose enough elections that they finally realize that their ideology has failed. The current GOP is not there yet by a long shot. They are still in the process of doubling down on their radical agenda at a time when the economy is still in ruins, the effects of globalization are being fully felt, the planet is in peril and about to reach a tipping point, and a radical fundamentalist movement is trying to blow people up. I don't think the world can take any more of the right's prescriptions for these problems right now: Lindsay Graham is considered too liberal and neo-Hooverism is their economic program. Yes, the Democrats are corrupt and inept. But the other side is batshit insane.

However, that doesn't mean that there's nothing we can do but wring our hands about how the system is broken and fret ourselves into inertia. The other way to send messages to the Democratic party is through the unsatisfying and often thankless process of primary challenges. Nobody can have any problem understanding that message, not even Adam Nagourney.

It's hard to find challengers and it's no wonder. It's expensive, time consuming and after all your hard work you will probably lose. It takes real commitment and a desire to not only win a seat in congress but do it by way of unseating an incumbent of your own party with whom you disagree, an act which is guaranted to make you an odd man out among the party hierarchy. But if you win, it can send shockwaves through the system.

And while I laugh at the Teabaggers, the one thing they do understand is if you don't like the people in your political party, you must present an alternative at primary time.

The other point is that there is a difference between the two parties.  On one side, Joe Lieberman is considered a party heretic because he doesn't want to provide a public option for health care coverage for Americans.  On the other side, Lindsey Graham is considered a party heretic because he doesn't want to torture foreign terror suspects.

Centrism is one thing.  But on other things you have to take a stand to change the system.  One side understands that, and it's not the good guys.