It probably makes them Libertarians.
Can you go back and show the Democratic party polices that aren't liberal in nature? I'd be interested in seeing that analysis.
The Libertarians also happen to have their own party. Not all of the Libertarians are apart of it yet, but give it time.
Policies where the Democrats and Liberals differ:
1.) Gay Marriage - Right off the bat, real Liberals are in support of Gay Marriage. Personally, I'd prefer we just make all "marriages" civil unions, with everybody (man/man, woman/woman, man/woman) getting the same rights. If you want to get married, go to the church. However, in lieu of that, I support Gay Marriage.
2.) Liberals are against the US Patriot Act that was passed with the help of Democrats.
3.) Ending the War on Drugs - This should of been done a long time ago. Many Democrats are against ending it though.
4.) Abolishing the Death Penalty, even Obama is for the Death Penalty in certain cases.
5.) Democrats were in support of the War in Iraq, Liberals aren't.
6.) Democrats have taken off the table long ago, the idea of a single-payer not-for-profit system for Universal Health Care.
7.) Don't Ask, Don't Tell - Implemented by a Democrat, Liberals oppose it.
8.) Abortion - There are a good number of Democrats that are Pro-Life, Liberals are generally Pro-Choice.
9.) Democrats continue to take bribes otherwise known as "campaign contributions" from lobbyists which is not a Liberal position. The Health Care debate is a sign of several Democrats on the Health Care Industry payroll. I am all for banning campaign contributions from companies or lobbyists.
10.) Legalizing Medical Marijuana or Marijuana in general, along with stopping raids on states that have legalized Medical Marijuana. Many Democrats are against legalization and want the raids to continue, Liberals don't.
That's only the things off the top top of my head. The problem with your question that you pose is there are several degrees of Democrats. Several Democrats who are actually Liberals agree with what I stated above, others don't. It's much like the differences between Libertarians and Republicans in the Republican party. Too broad of a brush you're painting with.