MINNEAPOLIS, June 13 - The swells who showed up before Al Franken's speech at a Democratic fund-raiser to down finger food and punch were thrilled to see him, all the more so because he continues to make threatening noises about running for the Senate here in 2008. A former writer and performer for "Saturday Night Live" and more recently a radio host on Air America, Mr. Franken has used his outsider status to hurl humor-based invective and indignation at the powers that be, but he is considering becoming part of what he so frequently assails. On Saturday evening he worked...