No such thing as a "clear-thinking liberal," this species simply does not exist. It is an oxymoron.
Bill Gates, Warren Buffet, John Corzine, Michael Bloomberg, Joe Lieberman, John Breaux and Daniel Patrick Moynihan (RIP) are (or were) all clear-thinking Liberals.
The problem is not the Liberalism, it's the race- and class-baiting that has made for power for so long.