Democracy is an ideal. Political equality (one person, one vote) is one of the core values of American democracy. Theoretically, each person should have an equal chance at influencing the political process. Resources (money), however, can undermine the principle of political equality by giving some more opportunity to influence the process.
The link below is the Center for Responsive Politics. There is a wealth of information on this site regarding campaign contributions and campaign finance laws. You can find the amount your Congressman raised and spent in the 2010 election and the amount Political Action Committees (PACs) contributed in the last election.
Center for Responsive Politics http://www.opensecrets.org/