Byline: Todd Spangler
DETROIT _ If Mackinac Island appears to be leaning to the right Friday, don't be alarmed.
All of the major GOP candidates for president plan to head north Friday and Saturday, joining some 2,000 rank-and-file party members for the biennial Mackinac Republican Leadership Conference.
And it's not the horse-drawn carriages, fudge shops and planked whitefish that are attracting media from Britain, France and Japan: It's an unsettled Republican presidential field, the return of native son Mitt Romney to a childhood vacation spot, and former U.S. Sen. (and "Law & Order" star) Fred Thompson's decision to finally join the pack as an announced candidate.
"This is clearly …