The question of whether President Obama should send more troops to Afghanistan misses the point.
What Obama really needs to do is: Invent a time machine, go back to the 2008 presidential campaign and not say, over and over and over again, that Afghanistan was a "war of necessity" while the war in Iraq was a "war of choice." (Oh, and as long as you're back there, ditch Van Jones, Valerie Jarrett and that gay "school safety" czar.)
The most important part of warfare is picking your battlefield, and President Bush picked Iraq for a reason.
Neither Iraq nor Afghanistan attacked us on 9/11 -- or the dozen other times American embassies, barracks and buildings came under jihadist onslaught since Jimmy Carter presided over "regime change" in Iran in 1979. Both countries -- and others -- gave succor to terrorists who had attacked the U.S. repeatedly, and would do so again.
As liberals endlessly reminded us during the three weeks of war in Afghanistan before the U.S. military swept into Kabul, Afghanistan has all the makings of a military disaster. It is mountainous, cave-pocked, tribal, has no resources worth fighting for and a populace that makes Khalid Sheikh Mohammed look like Alistair Cooke.
By contrast, Iraq had a relatively educated, pro-Western populace, but was ruled by a brutal third-world despot.
It's always something with the Muslims. You either have mostly sane people governed by a crazy dictator -- Iraq, Iran and Syria (also California and Michigan) -- or a crazy people governed by relatively sane leaders -- Pakistan and Afghanistan, post-U.S. invasion (also Vermont and Minnesota). There are also insane people ruled by insane leaders (but enough about the House Democratic Caucus). Sane people with sane rulers has not been fully tried yet.
Not only could regime change in Iraq work, but Iraq's countryside was susceptible to America's overwhelming air power. Also, Iraq has fabulous natural resources. Once the U.S. got control of Iraq's oil fields, the Shia, Sunni and Kurds could decide to either prosper together or starve together. (And it's not just oil: They're basically sitting on top of most of the world's proven reserves of cab drivers.)