Elections are decided by economics. Voters respond to pocketbook issues and are swayed by the huge sums that candidates lavish on advertising. Foreign policy issues, by contrast, are what the British call “noises off,” those sounds from off-stage that you hear occasionally to punctuate the main actions, sounds like exploding bombs and the distant cries of suffering people. According to recent polling, global issues barely register at all with Americans right now. Far below the economy, jobs, health care, the budget deficit, and gas prices, you’ll find Afghanistan at 6 percent (CNN), terrorism at 1 percent (Bloomberg), and, most distressingly, no global issue at all (CBS/New York Times).