I posted elsewhere in the thread, but figured it was worth replying directly - is there any way to find out who is making their own investment decisions, and who is having their money managed in a blind trust on their behalf? The two situations are obviously very different with respect to possible abuse.
Just realized, you could get the info manually if it's not already publicly available, given that there are only 100 senator. Their offices would probably just give that info, otherwise "refused to answer" would still be useful info to put on your site next to each senator's trades.