The problem most people on the left don't seem to realize is that they continue to support a political party that doesn't represent them or their interests. The Democratic party is the left wing of the capitalist party. It no longer bears any resemblance to the socialist policies of FDR. It's sole purpose today is to pretend to be an opposition party to the right wing of the same party.
For me, this reality is summed up by a man many on the left admire, but don't seem to understand very well. Here's a quote from him and it says everything about what's wrong with the political left in this country. To fully understand it's meaning, read it, dwell on it, think about it, meditate on it. It isn't subtle...it's in your face. But, sadly, most people on the left won't understand much of it at all or how significant such a simple statement truly is.
It's my signature quote I now post on every comment, etc.
"I'm not a Democrat or a Republican. I'm a socialist." - Bernie Sanders
Bernie for President 2012!