While it sounds relatively harmless, Mayors Against Illegal Guns is an anti-gun group founded by NYC Mayor Michael Bloomberg. Because it sounds like group against obvious bad thing, there is evidence that some of the current members don't really know or understand what agenda is being driven. Recent efforts by the blogosphere, pro-gun groups, and the NRA have been making them aware. Several mayors, especially from conservative districts, have left the group.
The mayors of Dover, Newark, and Wilmington are all members. I recently received an NRA flier about Vance Funk. Which would be great if I actually lived within the Newark city limits, but I don't. Perhaps I'll send the letter anyway and hope that he doesn't notice.