Not making a political statement, but "God Bless the U.S.A." by Lee Greenwood went double platinum (sold over 2 million copies). Saw him perform it at the '89 Boy Scout Jamboree.
Similarly, "Walking in Memphis" was nominated for a song of the year grammy in 1991, though it didn't win.
I submit "Lopin' Along Thru the Cosmos' by Judee Sill. Some good picks on this list. Looking forward to checking them out.