Trying to define a "liberal" (or a conservative for that matter) is somewhat slippery. It's kind of like the definition of porn; you know it when you see it.
Also, there are many moderate "liberals" and moderate "conservatives" that share some common ground/viewpoints; these are hard to clearly delineate. However, a "bleeding" liberal or a "staunch" conservative is, I think, a little easier to define.
I would define a bleeding liberal as someone that does not embrace "traditional" views of government, military, and religion. Many seem to be anti-war, for government growth (more programs, control, spending), and somewhat hostile toward religion and religious people. And add in a sort of strong "we know what's best for you" attitude.
So in sort I guess i'd say a person with a kind of socialist/european world view, and perhaps one that does not think that the US is that great of a country overall.
The "staunch" conservative probably has a military backgound or has military in his family, has a strong religious affiliation, believes in less government, flys the flag on all of the approriate holidays, is probably pro-war, has a strong sense of country and duty, and believes that the american way is the right way and that europeans are pussies
The staunch conservative will also probably have a strong attitude of "we know what's right for the country".
The "bleeding" liberals and the "staunch" conservatives don't care much for each other but the conversations and rhetoric between the groups does make for some good entertainment.
Ah well.... ya'll have fun with the above and keep the thread on an intelligent level