The Pittsburgh Post-Gazette shows us the 13th poll in seven weeks showing a GOP challenger leading a Democrat incumbent: An internal poll conducted by Republican firm the Tarrance Group for Mike Kelly's campaign and the NRCC shows the Butler car dealer well ahead of Rep. Kathy Dahlkemper, D-Erie, 48-37. The survey of 305 likely voters has a margin of error of 5.8 percent. Time for the caveats: It's a GOP poll, and similar surveys proved
