I saw quite a few more examples, but I tried to limit my response to those legislators still currently in office.
Rep. Dianne Feinstein (D-CA): "If I could have gotten 51 votes in the Senate of the United States for an outright ban, picking up every one of them 'Mr. and Mrs. America, turn 'em all in,' I would have done it."
http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/2004/03/07/EDGIV5EQ6B1.DTL
Rep. Carolyn McCarthy (D-NY) introduced H.R.1022 -- Assault Weapons Ban and Law Enforcement Protection Act of 2007
http://thomas.loc.gov/cgi-bin/query/z?c110:H.R.1022.IH:
In 2005, several members of the San Francisco Board of Supervisors introduced Proposition H: http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/2004/03/07/EDGIV5EQ6B1.DTL
Rep. Bobby Rush (D-IL): "My staff and I right now are working on a comprehensive gun-control bill. We don't have all the details, but for instance, regulating the sale and purchase of bullets. Ultimately, I would like to see the manufacture and possession of handguns banned except for military and police use. But that's the endgame. And in the meantime, there are some specific things that we can do with legislation." Evan Osnos, Bobby Rush; Democrat, U.S. House of Representatives, Chicago Tribune, Dec. 5, 1999, at C3 (quoting Rep. Bobby Rush (D-Ill.)).

What is the point of rules that are not enforced?