Candidates for office in Utah are filling out their pledges to campaign fairly. See http://www.voterlink.utah.gov/Fair%20Campaign%20Practice.pdf. In 2010 we saw incumbent senator Bob Bennett (a grandson of Heber J. Grant the 7th Mormon prophet) make this pledge and then we watched as he hired Tim Stewart (see http://www.facebook.com/bennettconsultingdc) to run his lobbying firm after it become known that Stewart (a counselor in the McLean Virginia Stake Presidency) was behind the sleazy temple mailer that was nearly effective and definitely in violation of this pledge. See http://www.sltrib.com/D=g/ci_15312005 for more info. Now Utah voters are asking themselves whether any of this new crop of candidates in Utah are going to take the Pledge seriously or whether they're going to break their word like Bennett did. Mormons sure believe in being honest in their dealings with their fellowman except in cases where they think they can get away with being sleazy to get gain.

Correct me if I'm wrong, but didn't Bennett also promise to serve only two terms as a senator, if he was originally elected?

The temple mailer you reference was distributed in favor of Mike Lee and AGAINST Bob Bennett. The mailer implied that BENNETT did not reflect LDS values. Lee defeated Bennett and Tim Bridgewater for the Senate nomination, and replaced Bennett as a the junior senator from Utah.

You just demonstrate why it was effective. The mailer was intended to get people to think it came from Mike Lee so it would backfire on him. It did backfire and almost cost Lee the election. However in the long run the truth came out that it was Bennett's ex-aide (and now the guy running Bennett's lobbying business) who was behind it all and that he did it for the benefit of Bennett. However some people such as you who haven't done their research were deceived.