When you're looking at the new data formats at data.fec.gov, be sure to play with the "Customize Data" button that appears to the right of the format options after you've clicked on a specific file.
This feature is intended to help you focus on a subset of campaigns or committees. The Leadership PAC list, for example, allows for searches for specific sponsors (i.e. members or candidates who sponsor the PAC) or just those committees that have raised or spent more than some threshold amount that you can choose.
You could do this yourself with the data from the files themselves, but sometimes the volume of data may make it better to narrow the focus before you download the data.
Let us know if there are other search options that would be helpful for these files.
