Jared Golden drops out of race.

Incumbent for second district says he will not be seeking a fifth term.. 

Former governor Paul lapage is now the front runner in race.

representative Chellie Pingree (D-Maine) released a statement about Golden's decision.

"I want to thank my colleague, fellow Mainer, and friend, Congressman Golden, for his years of service to Maine’s 2nd District. I’ve always had the utmost respect for Jared’s commitment, his work ethic, and his dedication to the people of Maine.
It’s heartbreaking to know what he and his family have endured during the increasingly polarized and toxic political climate of our times. Far too many elected officials have experienced threats and acts of violence, and there is absolutely no place for that in our country. Everyone who serves in elected office understands the toll that takes and I respect his decision to not seek another term. Whatever he chooses to do next, I know he’ll bring the same passion and conviction he brought to his work in Congress.
Maine’s 2nd District is one of the toughest, most competitive seats in the nation. But leaders like Jared—and Mike Michaud before him—have proven that Democrats can not only win there, but win consistently. Whoever carries that mantle next, I look forward to supporting them—and working closely with them to deliver real results for the people of Maine.
On behalf of my entire team, I want to extend my sincerest thanks and best wishes to Jared, his family, and his dedicated staff."

Did you read his statement?  A lot of good stuff that he pointed out.