If you want to understand liberalism in America, talk to liberals, especially if they're friends of yours.
I have plenty of liberal friends, and I've done just that. What I've found is a lack of logic, and all to often a very shallow knowledge of the issues. Their news comes from ABC, CBS and NBC, and that's it.
One things that's common to almost every last one is the objection to religion, or at least Christian conservatives. The whole "separation of church and state" issue, which they can't seem to admit does not exist in the Constitution.
Beyond that, their support of liberal policies is often based upon "the other guy." For example, they'll say that they have no problem with me owning all sorts of guns, but what about the other guy who might be a nut? They think it would be good to privatize Social Security, but what about the other guy who blows all of his SS money at a casino? They seem to dwell on a lot of hypotheticals that may not happen or have a remote chance of happening.