Trial on the Potomac” in place of the Senate, which, after the curtain call, must vote on whether or not to “convict” Tricky Dick at an impeachment trial, something Nixon avoided in real life by resigning.The results: of 26 showings so far, just one — a Sunday matinee — collected the required 67 votes to convict. All others found Nixon “not guilty.” The play at the Theatre at St.