Where (online) can I see which companies contribute funds to specific causes, issues and interest groups?

I'm a firm believer in voting with my wallet; therefore, I've been curious as to whether or not there is a web site that illustrates where certain companies stand on different issues. Not that this is necessarily the case, just an example - If i were vehemently pro-choice, I would like to know what companies are pro-life and adjust my patronage accordingly. Ideally, I'm looking for some sort of database, not limited to one issue or one type of company. This way, I can make a more empowered and informed decision when spending my money.