The National Rifle Association has given all Republican primary candidates in Maine's gubernatorial race an A rating, while also failing every candidate on the Democratic side.

Only one Republican, state Sen. Garrett Mason of Lisbon Falls, received the national pro-gun group's top grade of A+. The Portland Press Herald reports that two of the Republican candidates received an "AQ" rating, signifying they are pro-gun but have no voting record on Second Amendment legislation.

The grade is based only on the candidate's response to a NRA questionnaire.

The grades are issued by the NRA's political operation, the NRA-Political Victory Fund. The ratings come about one week before Maine voters head to the polls to select for the June 12 primary.

Read more from our friends at the NRA