Outside groups spend millions during an election to influence voters' decisions with political advertising. Explore those expenditures here at OpenSecrets.org.
The term "outside spending" refers to political expenditures made by groups or individuals independently of, and not coordinated with, candidates' committees. Groups in this category range from conventional party committees to the more controversial super PACs and 501(c) "dark money" organizations.
Here at OpenSecrets.org, we provide breakdowns of data reported by outside spending groups to the Federal Election Commission, with a separate section devoted to data we've dug up on contributions to politically active nonprofits -- over $760 million and counting -- which aren't required to publicly report their donors.
Read more at http://www.opensecrets.org/outsidespending/