HARRISBURG, Pa. (AP) — A long-time county prosecutor and four-time candidate for state attorney general says he’ll pursue the eastern Pennsylvania congressional seat being vacated by Republican U.S. Rep. Charles Dent.

Northampton County District Attorney John Morganelli said Monday that he’ll seek the Democratic Party’s nomination in the May 15 primary election.

Dent won’t seek another term after holding the 15th District seat since 2005.

The Democratic and Republican fields are jam-packed, and March 6 is the deadline to file paperwork to get on the primary ballot. Morganelli becomes the highest-profile Democrat to seek the seat.

Republicans dramatically redrew the district boundaries in 2011 to make it more Republican friendly, breaking decades of precedent to stretch its boundaries almost 90 miles into conservative central Pennsylvania.

Registered Democrats still outnumber Republicans in the district.