FILE - In this June 1, 2012 file photo, President Barack Obama 

FILE - In this June 1, 2012 file photo, President Barack Obama is greeted by Sen. Al Franken, D-Minn., left, and Sen. Amy Klobuchar, D-Minn. upon his arrival at Minneapolis-St. Paul International Airport in Minneapolis. Republicans figured he would be an easy target the second time around. But Franken has transformed his race into one that many national Republicans are writing off, choosing to focus their money instead on more vulnerable Democrats. He's done it in part by transforming his image from the wisecracking former Saturday Night Live star into quiet policy work. (AP Photo/Carolyn Kaster)
Associated Press
FILE - In this June 1, 2012 file photo, President Barack Obama is greeted by Sen. Al Franken, D-Minn., left, and Sen. Amy Klobuchar, D-Minn. upon his arrival at Minneapolis-St. Paul International Airport in Minneapolis. Republicans figured he would be an easy target the second time around. But Franken has transformed his race into one that many national Republicans are writing off, choosing to focus their money instead on more vulnerable Democrats. He's done it in part by transforming his image from the wisecracking former Saturday Night Live star into quiet policy work. (AP Photo/Carolyn Kaster)
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