Please go to his public appearances, ask him the following question, and then upload his response to video sharing sites. Feel free to print out this page, including the citations, for those who want more information.
Senator Obama: You spoke at the May 1, 2006 illegal immigration march in Chicago.
Those marching in our streets demanded that we change our laws, and the government of Mexico would be a major beneficiary of those changes. And, the Chicago Tribune and other sources reported that some of the key organizers of the march you attended have links to the Mexican government and Mexican political parties. (I have the citations here if anyone would like to see them.)
Leaving aside your thoughts on immigration "reform", could you please explain why you think it's appropriate for United States Senators to take part in events designed to change our laws, when those events are organized in part by those with links to foreign countries and foreign political parties? Could you please explain why you support such obvious meddling in our internal politics?
(Shorter version: Is it appropriate for United States Senators to support events with such close links to foreign citizens who are trying to change our laws, including representatives of foreign political parties?)
~~~~~~~~~~ CITATIONS ~~~~~~~~~~
 "Chicago Giant put rest of country on notice", Scott Fornek, Chicago Sun-Times, April 2, 2006
 "Monday's immigration rally to snarl traffic, not business", Chicago Business, Lorene Yue, April 28, 2006, http://www.chicagobusiness.com/cgi-bin/news.pl?id=20400
 "Protesters renew their call for Immigration rights", Antonio Olivo and Oscar Avila, Chicago Tribune, May 1, 2006
 "Immigrants at crossroads", Oscar Avila and Michael Martinez, Chicago Tribune, May 1, 2006 (copy at nakasec.org/bbs/view.php?id=nakasecinnews&no=17)
 "Organizing the new movement", Socialist Worker, Lee Sustar, April 28, 2006, socialistworker.org/2006-1/586/586_05_Organizing.shtml
 "May 1 Immigrant Rights March: 'Birth of a Movement'", Community Media Workshop, Gordon Mayer, April 25, 2006, newstips.org/interior.php?section=Newstips&main_id=606
 "In Chicago, A Tale of Two Mexican Consulates", All Things Considered, Cheryl Corley, December 2, 2006, http://www.npr.org/templates/story/story.php?storyId=6570821
 Democracy Now, April 21st, 2006, democracynow.org/article.pl?sid=06/04/21/132239
 press releases www.modelsnewsletter.com/cee/classifieds/immigration/main.htm
 "Irked Mexicans open alternate consulate", Chicago Tribune, Oscar Avila, November 29, 2006