One of the Left's greatest handicaps is our inability to work together. For reasons that escape me, liberal groups seem to look at the world as a zero-sum game in which Group A's particular cause must be front-and-center in whatever is going on at the moment. You can see this at work in almost any large and well-publicized demonstration. If there's a march for climate-change awareness, you'll find groups of people with giant puppets protesting against abortion restrictions. If there's a march against Wall Street's depredations, you'll find people pushing to get the U.S. out of Burkina Faso. Worse, at far too many such events, you'll find violent anarchists and simple vandals who just want to smash something, whether it's the state or somebody's store-front windows.
This inability to make common cause results in liberal events being ignored by the media, or else what media attention does accrue ends up being focused on the smallest, most colorful and vocal groups. Whatever the message could have been becomes watered down, mockable, ignorable. Or, if the anarchists show up, it becomes "Look at those violent anti-social liberals!"
The inestimable TBogg <a href="http://tbogg.firedoglake.com/2008/02/25/your-mumia-sweatshirt-wont-get-you-into-heaven-anymore">nailed a part of this phenomenon</a> back in 2008. Here we are, six years later, and I still run into people who won't vote because they're not getting everything they wanted delivered in one candidate or campaign, or because they personal pet cause is not being showcased and promoted.
If there's one thing the Right understands, it's that all of their causes are ultimately tied together. The Bible bangers may not care at all about eliminating the Estate Tax, but they understand that their agenda of imposing Christian Sharia on America depends on getting sympathetic candidates into office. So they'll campaign for, raise money for, and ultimately vote for a candidate who is at least making sympathetic noises in their direction. And if that candidate doesn't deliver once in office, they'll still back him or her until someone more inclined (read "extreme") makes an appearance.
So the question becomes, how do we get all the disparate groups on the Left to understand that their individual causes actually align? And then, how do we get them to unite behind candidates who represent something close to that unified view?