As someone who believes that taxes in the future are likely to be higher than they are today, I tend to listen whenever David Walker opens his mouth. Walker served as Comptroller General of the United States from 1998 to 2008. Then in 2009, he famously opined that tax rates would likely have to double to liquidate our nation’s debt and pay for underfunded entitlement programs like Social Security andMedicare. Since then, Walker has been on a “Comeback America” tour. He travels the nation raising the warning cry about our country’s ongoing fiscal challenges.