The district is 50/50 I think (quite rural) so if he wins the primary he has a good shot against the Dem.
https://ericbrakey.com/
“I am proud to endorse my friend Eric Brakey in his candidacy to be the Republican nominee for Maine’s Second Congressional District. Eric has been a champion for freedom in the Maine Senate and will fight for liberty in Congress. Eric and I support President Trump and his America First foreign policy. I truly believe Eric is best suited to take back this seat from Jared Golden. Today I stand with Eric Brakey and urge all the voters of his district to support him and send him to Congress.” – Rand Paul