Bringing to mind Bob Hope's free USO performances during World War II, Korea and Vietnam, Jay Leno staged a free show in embattled Detroit (suburban Auburn Hills) Tuesday and scheduled another for tonight (Wednesday) for "anyone who is out of work." (Michigan has the nation's highest unemployment rate, 12 percent.) Leno, who reportedly owns one of the largest private car collections, called the performance "Jay's Comedy Stimulus Plan." When it was over, he asked the crowd, "How many union people we got here?" When the applause died down, he said, "I want to thank you. You guys created the middle class. ... God bless Detroit!"