MADISON, Wis. (AP) – Former Trek Bicycle executive Mary Burke has officially entered the race for governor.   Burke, a Democrat, made the announcement Monday morning.  The Harvard-educated former business executive has also led the Wisconsin Department of Commerce.  Burke is the daughter of Richard Burke, who founded Trek Bicycle in 1976 in Waterloo. She worked for the company in a variety of capacities, including as its director of European operations, helping to start and oversee companies in seven countries.    Burke left Trek in 2005, when then-Gov. Jim Doyle tapped her to serve as Commerce Department secretary. She held the post for two years.  Republican Gov. Scott Walker is seeking re-election in 2014 after winning the governor’s office in 2010 and surviving a recall last year.