Train of thought: A letter to Sen. Arlen Specter By Diana WestJuly 20, 2007 Dear Sen. Specter: I'm writing today because I didn't get a chance to respond to your parting comment as you left the train last week in Philadelphia. If you recall, we were both riding the Acela out of Washington; I was the columnist sitting across the aisle from you (both literally and in a Washington way, often, figuratively). I introduced myself and offered you that day's column for your reading pleasure. You can't blame a gal: How often do the ink-stained wretched get a U.S....