President Obama has asked the television networks for 15 minutes tonight, and he's going to pack quite a bit of messaging into that short period of time. Why do we need a speech marking the end of the combat mission in Iraq? It's because we're going to need, according to Obama, to understand the future of the war in Afghanistan and the interconnectedness of foreign and domestic policy in a way that reflects what Obama was able to do in Iraq.
What did he do? He set a time-frame and stuck to it. Iraq will now begin to fend for itself. He promised during his presidential campaign that he would end the Iraq war "responsibly." He will note tonight that his administration managed to withdraw 100,000 troops from Iraq "responsibly." He will portray this as a major milestone in his presidency.
We forget how integral Sen. Barack Obama's decision to oppose the Iraq war was to his own political awakening, and how many contortions Hillary Clinton had to untwist in order to justify her own support for the war authority, and how, by the day of the general election, given the success of the surge (or the success of JSOC's counterterrorism efforts), Iraq was no longer a central voting issue. Voters seemed to exorcise that demon in 2006, when they voted Democrats into Congress.