If you received an envelope with the slogan “JURY DUTY IS GOOD CITIZENSHIP” on the outside… would you think it’s a jury summons?

Supporters of Proposition 77 think so… which is why they say they’re mad enough to file a formal complaint over a “No on 77″ mailer that went out this week, in an envelope with no other language on the outside other than the above phrase.

Inside, the mailer is targeted specifically to Republicans, claiming that everyone from U.S. House Speaker Dennis Hastert (R-Illinois) to GOP National Chairman Ken Mehlman are opposed to the redistricting initiative. The mailer goes on to say that “Governor Schwarzenegger is sincere, but like a moth to a flame, he is drawn to 77 by the state legislature.” It goes on to urge a “yes” vote on the governor’s other preferred initiatives– Propositions 74, 75, and 76– but a “no” vote on redistricting.

The mailer says it comes from a group called Citizens For Good Government. They are not, I’m told, affiliated with the official “No on 77″ campaign. In fact, it took several hours for anyone to call back with some explanations.

The person who finally did call back was Tom Kaptain, who identified himself only as a “slate mailer.” He confirmed he’s the one behind this piece of mail, but wouldn’t say who paid for the mailings… saying he was too busy to keep talking.

The only other clues to the group may be in its mailing address, which happens to be the same mailing address used in the past for activities affiliated with Democratic Assemblymembers Jerome Horton (D-Inglewood) and Tom Umberg (D-Santa Ana), and with U.S. Representative Diane Watson (D-LA). It was also the address listed in voter information guides for the campaign supporting last year’s Indian gaming initiative, Proposition 68.

That’s not to say any of these folks are affiliated with this mailing, simply that someone who has done work for them is now working on this issue.