Nearly 70 years after Milton Friedman first proposed K-12 education vouchers, students in Arizona, Iowa, Utah, West Virginia, and other states can customize their education using education savings accounts (ESAs). ESAs allow parents to spend public education funding on expenses such as private school tuition, tutoring, and homeschooling curricula. However the vast majority of students nationwide (84 percent) still attend traditional public schools--and will for the foreseeable future. Conservatives would be wise to support policies that give families choice within the public education system. The authors argue that cross-district open enrollment does precisely that, and it has strong bipartisan support. One state where families are reaping the benefits of open enrollment is Wisconsin. This article describes the state's experience with open enrollment over the past 25 years.