They are progressive on social issues and believes the role government is to take of it's citizens or at the very least provide a safety net or floor for those with the least.
Generally speaking most are Pro-choice, in favor of some form of gun control, anti death penalty, strongly support freedom of speech, separation of church and state, civil rights, anti-discrimination laws, and regulations to protect citizens from unhealthful food, water, air quality, cars, and other safety concerns related to business.
They believe in protesting to enact or push for change.
In favor of raising taxes to balance budget and keep programs.
Having said that just about everyone is liberal about some things and conservative about others. Younger people tend to be more liberal than older ones. Once you accumulate a certain amount of assets you become less in favor of raising taxes!:)