Shenna Bellows (D) (AP Photo/Michael C. York)

Shenna Bellows, the underdog Democrat challenging Sen. Susan Collins (R-Maine), plans to walk from one end of the Pine Tree State to the other this summer.

"From July 19 - August 12, I will walk over 350 miles through more than 60 communities from Aroostook to York County on a month-long 'Walk with ME for Jobs and the Economy,'" Bellows said in statement online that encourages supporters to sign up with their contact information.

York County lies at the southern end of Maine while Aroostook is near the northern border.

Bellows, who is backed by the Democratic Senatorial Campaign Committee, is a long-shot to unseat the popular Collins. She is a former executive director of the American Civil Liberties Union running on a staunchly liberal platform.

In an interview with The Washington Post in March, Bellows praised both Sens. Elizabeth Warren (D-Mass.) and Rand Paul (R-Ky.).

Sean Sullivan has covered national politics for The Washington Post since 2012.