I managed to get the thing sent in. For the record, better links are here for the sending messages to Congress, and here for signing their petition.

No matter who writes what to them, though, I predict that my Representative (Schakowsky) and one of my Senators (Durbin) will vote against it. The other Senator (Fitzgerald) will probably vote for it unless it's one of those personal principle things he differs from his party on, and either way, what anyone else tells him won't matter. He's very principled, which I respect; I just wish he shared more of _my_ principles.