Barry Ritholtz asks "Who Are the Most Influential Liberal Thinkers?"
I would eagerly second many of the suggestions already made in the comments:
Eric Alterman
Noam Chomsky
Glenn Greenwald
Naomi Klein
Robert Kuttner
Lewis Lapham
Rachel Maddow
Bill Moyers
Robert Reich
Tom Tomorrow
Howard Zinn
as well as contribute these:
Bob Altemeyer
Eric Foner
Todd Gitlin
William Greider
Sam Harris
George Lakoff
Michael Lind
Juliet Schor
Gore Vidal
update (1/4 @ 10:01pm):
Lest anyone accuse me of ignoring theists...I omitted a group of religious thinkers from this list, a problem which I will now rectify:
Forrest Church
Michael Lerner
John Shelby Spong
Jim Wallis
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