Pollsters are predicting net gains for Republicans in this year's Congressional midterm elections. But in New Jersey, two districts currently in the GOP's hands may potentially swing the Democrats' way.

The competitive race in the state's 5th district has surprised many, with first-time candidate Roy Cho (D) making steady gains against longtime incumbent Rep. Scott Garrett (R).

A Tea Party favorite, Garrett has name recognition and a fund-raising advantage on his side. But after redistricting expanded the largely rural 5th District into parts of suburban Bergen County, Garrett has found himself representing a more diverse constituency, allowing the Democrat Cho to make inroads among the electorate.

"Scott Garret is really one of the few incumbents in New Jersey who is facing a significant challenge," said Montclair State University Political Science Professor Brigid Callahan Harrison. "This is going to come down to a ground war. Who has the best operation in the field and who is best able to turn out their supporters."

In the state's 3rd district along the southern Jersey shore, Democratic candidate Aimee Belgard has been running neck-and-neck against GOP candidate Tom MacArthur. MacArthur is being criticized as a carpetbagger, after he left his Bergen County home and relocated to the Jersey Shore in order to run for the seat that's being vacated by Rep. Jon Runyan (R).