I like this site

Readers are predominantly hard left, but the mission of the site is to "preach" to other than the choir and "proselytize" for liberalism.

http://leftsolutions.wordpress.com/

Not that there should be any reluctance to hold high the banner of "liberalism." The presidents that the U.S. can be proudest of in the 20th century were all liberals or progressives: the Roosevelts, Truman, Carter, Kennedy (and yes, I'm adding Clinton to the list.) I'm especially fond of the following quotations by my two personal favorites:

A strong nation, like a strong person, can afford to be gentle, firm, thoughtful, and restrained. It can afford to extend a helping hand to others. It is a weak nation, like a weak person, that must behave with bluster and boasting and rashness and other signs of insecurity.
-- Jimmy Carter, 39th U.S. President

"… I'm proud to say I'm a 'Liberal': someone who looks ahead and not behind, someone who welcomes new ideas without rigid reactions, someone who cares about the welfare of the people -- their health, their housing, their schools, their jobs, their civil rights, and their civil liberties -- someone who believes we can break through the stalemate and suspicions that grip us in our policies abroad."
-- John Fitzgerald Kennedy 35th U.S. President
As for yours truly, I'd be most accurately described as a Christian Socialist at this point in my life. Currently, I'm reading: BETWEEN MARX AND CHRIST by James Bentley (a history of Christian Socialist thought) and THE MAKINGS OF A JUST SOCIETY by Chester Bowles. Neither is available on the internet so far as I know.