In a photo taken last Thursday and carried in newspapers nationwide, Pennsylvania Democratic Senate candidate, Rep. Joe Sestak, D-Pa., greets people after a filming of MSNBC's Hardball with Chris Matthews at Temple. Sestak has trailed Pennsylvania Republican Senate candidate Pat Toomey for months, yet recent polls suggest Sestak has closed the gap. The Sestak-Toomey race mirrors other Senate contests that are making this one of the most intriguing and unpredictable midterm elections in years.