It seems like eons ago that Barack Obama took a hit when somebody leaked a controversial Canadian memo on NAFTA just before the Ohio presidential primary, damaging his chances there . Canadian officials are still trying to figure out the source of the leak. Now the Toronto Star says it has identified a culprit: Frank Sensenbrenner , son of longtime Wisconsin Rep. Jim Sensenbrenner . (Frank is pictured here with the former Sri Lanka ambassador to the U.S.) The memo suggested that Obama was talking out of both sides of his mouth about free trade, telling Ohio voters one thing and Canadian officials another. Of course, many people north of the border are none too thrilled about the incident - dubbed "NAFTA-gate" in the Canadian press - now that Obama is the presumptive Democratic presidential nominee. A recent internal investigation didn't identify the source of the leak. But last week, Toronto Star columnist James Travers quoted sources saying Prime Minister Stephen Harper's office slipped the controversial document to Frank Sensenbrenner, who then leaked it to the media. For a short time last year, Frank Sensenbrenner was a congressional liaison for the Canadian embassy in D.C. In a follow-up front-page story , the Toronto Sun painted a largely unflattering picture of the junior Sensenbrenner, who is 27. In it, he denied distributing the document to anyone. "I am dismayed at the allegations ... that I had a role in the leak of a Ca ...