Calling his K-12 task force a success, Gov. Butch Otter wants to employ a similar approach to higher education.On Friday, Otter announced that he will create a 28-member higher education task force — in hopes of improving Idaho’s stagnant college completion rates. The task force comes as Idaho continues to struggle to meet a goal dating back to 2010: getting 60 percent of the state’s 25- to 34-year-olds to hold a postsecondary degree by 2020. Otter has championed that cause for years — in concert with education, political and business leaders — to little avail. Only 46 percent of Idaho’s high school graduating class of 2015 enrolled in college within 12 months, down from 52 percent a year earlier.