from the atlantic: last fall Senator Barbara Boxer introduced the "Moving Ahead for Progress in the 21st Century Act" (or "MAP-21" as it's now called), to reauthorize funds for federal highway and transportation programs.
While that doesn't sound like anything having to do with your taxes, the bill includes a little-noticed section that allows the State Department to "deny, revoke or limit" passport rights for any taxpayers with "serious delinquencies," proposed Sen. Harry Reid (D-Nev.).