At the bottom of this and all other "Money Trail" pages on OpenCongress, there's a note explaining that OpenCongress aggregates this data from other sources:
Data on bill support and opposition provided by MapLight.
Campaign contribution data provided by OpenSecrets.org, the nonpartisan guide to money in politics. Contribution data is constantly being updated and this data may not be entirely up to date.
Slashdot Mirror
At the bottom of this and all other "Money Trail" pages on OpenCongress, there's a note explaining that OpenCongress aggregates this data from other sources:
Data on bill support and opposition provided by MapLight.
Campaign contribution data provided by OpenSecrets.org, the nonpartisan guide to money in politics. Contribution data is constantly being updated and this data may not be entirely up to date.