Minnesota Congresswomen and presidential candidate Michele Bachmann has become the latest politician to call for an impenetrable fence along the entire length of the border with Mexico. "President Obama has failed the American people by failing to secure the southern border," said Bachmann. "I will secure that border and that will be Job One." Statements like that may get some attention, but they are not practical. Don't take our word for it; take Rick Perry's. The Texas governor has been called a lot of things, but he's hardly a mushy liberal. Yet even this tough Texan sneers at calls for...