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Know thy image. With memories of Sam Ervin's country-lawyer routines still fresh, the entire committee could wind up sounding like Hee Haw. Do not try to be folksy if Grandpappy was a Main Line Philadelphia lawyer. A congressional committee should be as varied as a World War II platoon. There are still fine roles available for a moralistic New Englander, a tough ethnic and a Jimmy Stewart-type Midwesterner. Above all, remember there is no such thing as a small part if it helps you get re-elected. And that, along with the pursuit of truth and justice, is part of these hearings.