This is ridiculous. A Generic D would be perfectly fine in this district. It voted to the left of the country in 2012, ffs.
Yes, if we assume LoBiondo is always going to retire in a 2018 environment, then I suspect any D would be picking this seat up. However, only van Drew could make this seat the second (third?) seat triaged this cycle by the GOP. (after PA-06, PA-05?)
If you want to see a Progressive upside, picture it like this. If it wasn't van drew then more dem money would be wasted in the expensive Philly market picking up a seat. With van Drew though, dem money can be dispersed to other competitive seats who have a whole host of people with varying ideologies running.