Oct. 4, 2010 - Visa gave contributions totaling more than $400,000. Mastercard made contributions nearing $600,000. American Express was by far the most generous, making contributions that amount to more than $2,000,000. Read more
Read the details about our data sources and methodology. Contributions data provided by the Center for Responsive Politics (OpenSecrets.org). Legislative data from GovTrack.us.