One of the greatest achievements in the life of an astronomer is to discover a new planet or solar system. In the political world, the equivalent is uncovering a new voting bloc.When writing my latest book, "The Audacity of Deceit: Barack Obama's War on American Values," I discovered a relatively unknown constituency: the 30% of American voters who do not pay federal income taxes. These Americans are exempt from paying income taxes either because their income level is below the threshold that would require them to pay, or their total deductions leave them with no income-tax liability. So I set...