From the New York Times (may require free registration):
http://www.nytimes.com/2004/01/29/opinion/29REIC.html Here is an Excerpt:
After all, Democrats have seen what the Republican Party has been able to accomplish over the years. The conservative movement has developed dedicated sources of money and legions of ground troops who not only get out the vote, but also spend the time between elections persuading others to join their ranks. It has devised frames of reference that are used repeatedly in policy debates (among them: it's your money, tax and spend, political correctness, class warfare).
It has a system for recruiting and electing officials nationwide who share the same world view and who will vote accordingly. And it has a coherent ideology uniting evangelical Christians, blue-collar whites in the South and West, and big business - an ideology in which foreign enemies, domestic poverty and crime, and homosexuality all must be met with strict punishment and religious orthodoxy.
In contrast, the Democratic Party has had no analogous movement to animate it. Instead, every four years party loyalists throw themselves behind a presidential candidate who they believe will deliver them from the rising conservative tide. After the election, they go back to whatever they were doing before. Other Democrats have involved themselves in single-issue politics - the environment, campaign finance, the war in Iraq and so on - but these battles have failed to build a political movement. Issues rise and fall, depending on which interests are threatened and when. They can even divide Democrats, as each advocacy group scrambles after the same set of liberal donors and competes for the limited attention of the news media.