Many liberals have stopped calling themselves "liberal" in favor of "progressive" -- a term that hasn't yet become a vile epithet. Let's help it along.
A "liberal" is a person who is liberal with others' money and liberal in the use of the law to tell others how to live their lives.
A "progressive" is a person who believes in progressively raising taxes, as an excuse for spending others' money, and who believes in progressively broadening the power of government to tell others how to live their lives.
How's that for a start?