He did this last time he rand for Prez, as well, and as others have noted, implied, etc., despite a business link, and potential campaign donations, there is nothing wrong with affinity purchasing.
As for those who might think that Mormons are a monolithic group of politically active Republicans, in order to refute such an idea, one need only remember that one of Prez. Obama's biggest boosters in Congress is the Senate Majority leader, Harry Reid of Nevada.