Our friends at the National Institute on Money in State Politics have prepared an overview of the funding of Pennsylvania races. On the organization's homepage (www.followthemoney.org) you can type in your home address and get an overview of their campaign financing.
One of their search options:
The Legislative Committee Analysis Tool (L-CAT) on FollowTheMoney.org displays legislative committee rosters alongside campaign donor data. This data mash-up provided by the National Institute on Money in State Politics and Project Vote Smart allows citizens to see which special interests have (or don’t have) political-donation relationships with lawmakers who sit on influential committees; committees that have the power to pass laws that directly affect these interests.