Jeff Stoltman, Wayne State marketing professor, commented in a story about Cadillac\'s new ad campaign called \"Life. Liberty. And the Pursuit.\" Scheduled for launch on Friday, the campaign will consist of 15 television spots and various print ads. This is Cadillac\'s first ad campaign since it switched its advertising duties to a Boston-based firm following several years of using Leo Burnett-Detroit. Stoltman said that it\'s not unusual for an advertiser to switch from a successful campaign after a few years. \"There\'s a prevailing thought that campaigns go through a wear-out phase,\" he said. \"After a while, people just tune it out.\"