As Obama heads to Martha?s Vineyard for the hottest week of the summer, it's Afghanistan, no longer Hurricane Bill, that's lurking. For the first time since the US invasion of Afghanistan a majority of Americans polled no longer think the war is worth fighting. On Sunday?s Meet the Press, the Chairman of the Joint Chiefs of Staff Admiral Mike Mullen muttered this about waning support: ?Certainly the numbers are of concern,? but, ?this is the war we?re in.? "I don't see this a mission of endless drift. I think we know what to do." Mullen's a Vietnam Veteran, and so is that line of thinking. Meanwhile, Iraq Veterans Against the War, at its annual meeting earlier this month, voted after a long and tendentious debate to oppose the Afghanistan deployment and called for reparations for the Afghan people and ?the immediate and unconditional withdrawal" of all occupying forces. The voters weren't draftees, reluctant participants in the Afghanistan attack, but rather men and women many of whom signed up eagerly after the attacks of 9-11. Some still wear the uniform. In Roosevelt's day, disillusioned, unemployed and frustrated vets marched on Washington and were brutally suppressed by US army troops led by George S. Patton and Douglas MacArthur. It's not too hard to imagine the same thing happening in this generation. Outside the military, columnist Paul Krugman suggested recently that some of the progressive backlash over healthcare may be as a ?proxy for broader questions including frustration over his handling of Afghanistan." The question now is whether Obama can shift or wants to. On the war, it?s unlikely. US special envoy Richard Holbrooke visited all four US command centers over the weekend and received the same message from American military commanders. They need more troops to do their job. And Obama's repeatedly said he'll listen to the commanders. The number of US troops in Afghanistan is nearing 68,000 and rising. Think healthcare is the president?s Achilles heel? Achilles, like most folks, had two of them. Less