Freshman Republican incumbent Charlie Dent now has a Democratic challenger, Charles Dertinger. Dertinger is currently a Northampton county councilman and is on the November ballot after getting 3700+ write in votes, no msall task.
article from Pennlive.com 6/07 ("It'll be Dertinger vs. Dent in fall," By Daniel Hausmann)
Description of district from Dent's congressional website:
The 15th District of Pennsylvania is a diverse area in Eastern Pennsylvania, comprising all or parts of Lehigh, Northampton , Montgomery and Berks counties. The district includes the Lehigh Valley , Indian Valley and Upper Perkiomen Valley regions.
The majority of the district's population lives in the Lehigh Valley — Pennsylvania 's third-largest metropolitan area, comprised of the cities of Allentown , Bethlehem and Easton , and numerous surrounding boroughs and townships.