Greg Giroux, writing at CQ Politics, compiles a Top 10 List of Best-Funded House Challengers, including the Democratic challengers to Rep. Jim Gerlach (PA-6th) and Rep. Charlie Dent (PA-15th).

Here's what Giroux has to say about the well-funded challengers:

Doug Pike (D-Pa.), $1.2 million. Pike, a former editorial writer for the Philadelphia Inquirer, has put in nearly $1.1 million of his own money. He'll square off against Rep. Jim Gerlach in the fall, provided he first beats physician Manan Trivedi in a Democratic primary. Gerlach has a relatively low cash-on-hand total ($336,000) because he announced only in January that he would seek re-election after waging a months-long campaign for governor that stalled.

John Callahan (D-Pa.), $831,000. Callahan is the mayor of Bethlehem, one of the population centers of Pennsylvania's 15th district, where Rep. Charlie Dent ($825,000) is seeking a fourth term.

Check out the full list at CQ Politics