We've narrowed our list down to three Senators: Sen. Jon Kyl (R-AZ), Sen. David Vitter (R-LA), and Sen. Judd Gregg (R-NH). Our callers have been vigorously calling these offices to try and track down the Senator anonymously blocking Sen. Russ Feingold's electronic filing bill. We may be ready to cross Sen. Gregg's name off the list as we have received a few responses from callers like this one from Sunlight caller PH: "In Sen. Gregg's office, staff memember "Tim" said, to my knowledge Sen. Gregg did not place the secret hold on S. 223." Sen. Gregg is still a suspect. Sen. Vitter's office appears to have been deluged with calls over this as the press secretary's mailbox is completely full with calls about the blocked bill.[Vitter says “NO” – PB]

Sen. Kyl's office appears to be the most evasive with staffers saying things like, "it's a secret hold, so it's a secret," and, "we have no public statement to make." Another caller to Kyl's office noted that the staffer said that Sen. Feingold knows and that we should ask him. Feingold, however, denies having been told who the Senator is in this blog post. Keep the pressure on! Use this comment form to notify us of your interactions with staff and your findings.