Mainly, though, the Democratic Party has become the party of reaction. In reaction to a war that is ill conceived, we appear suspicious of all military action. In reaction to those who proclaim the market can cure all ills, we resist efforts to use market principles to tackle pressing problems. In reaction to religious overreach, we equate tolerance with secularism, and forfeit the moral language that would help infuse our policies with a larger meaning. We lose elections and hope for the courts to foil Republican plans. We lost the courts and wait for a White House scandal.And increasingly we feel the need to match the Republican right in stridency and hardball tactics. The accepted wisdom that drives many advocacy groups and Democratic activists these days goes like this: The Republican Party has been able to consistently win elections not by expanding its base but by vilifying Democrats, driving wedges into the electorate, energizing its right wing, and disciplining those who stray from the party line. If the Democrats ever want to get back into power, then they will have to take up the same approach....Ultimately, though, I believe any attempt by Democrats to pursue a more sharply partisan and ideological strategy misapprehends the moment we're in. I am convinced that whenever we exaggerate or demonize, oversimplify or overstate our case, we lose. Whenever we dumb down the political debate, we lose. For it's precisely the pursuit of ideological purity, the rigid orthodoxy and the sheer predictability of our current political debate, that keeps us from finding new ways to meet the challenges we face as a country. It's what keeps us locked in "either/or" thinking: the notion that we can have only big government or no government; the assumption that we must either tolerate forty-six million without health insurance or embrace "socialized medicine". It is such doctrinaire thinking and stark partisanship that have turned Americans off of politics. 
Barack Obama, The Audacity of Hope: Thoughts on Reclaiming the American Dream
politics