Budget information for local governments -- including salaries -- is frequently available to the public, and often posted on municipal websites.
American Factfinder - A product of the US Census, American Factfinder provides Census data in user friendly format.
SimplyMap - SimplyMap is an online GIS product that maps demographic and market data. Use it when you need demographic and marketing data for a specific geographic area in the U.S. such as a city, county, census tract, or ZIP code.
Besides being a good general source of news and statistics, LexisNexis is also a great source for legal and congressional information.
For Congressional information, go to Proquest Congressional
You can also find legal analyses of your topic in LexisNexis Academic.