To be clear, I don’t think it’s even entirely coherent to talk about liberalism versus conservatism as the fundamental political/philosophy conflict in the United States anymore. What I call mainstream American political conservatism is really just incoherent, violent rage. And the nominal liberalism of the Democratic Party under Barack Obama is so measured, heavily qualified and internally diverse (spanning the ideological spectrum from Dennis Kucinich to Bart Stupak) that it can barely be called liberalism at all.
The real split in this country now is between people (left or right) who are actually concerned with solving problems and people (left or right, Code Pink or Tea Party) who just feel like blindly emoting.
Although, of course, blindly emoting without resorting to violence, vandalism and death threats is obviously vastly preferable to what we’re currently seeing from the Tea Party fringes.