A site called Homesnacks rated cities with populations of 200,000 or more according to voting records. The liberal list in descending order is:
Washington
Baltimore
Philadelphia
San Francisco
St. Louis
New York
New Orleans
Oakland
Fremont
Newark
The most conservative in descending order are:
Lubbock, TX
Plano, TX
Tulsa, OK
Colorado Springs, CO
Oklahoma City, OK
Wichita, KS
Fort Wayne, IN
Bakersfield, CA
Arlington, TX
Fort Worth, TX