Mexico's new President wants to shift attention away from severed heads, mass graves and bodies hanging from bridges to a growing economy. So does President Obama on today's visit to the "Aztec Tiger," which is booming enough to attract foreign investors after years of paralysis. But the drug wars are not over. Four thousand people have died since Enrique Peña Nieto took office, and now vigilantes are taking the law into their own hands. Will stepped-up US enforcement aid still be welcome? Will security be the elephant in the room?