He was against it; before he was for it.
There are a few reasons why to suspect Obama has Attention Deificit, may this be another? The criteria for ADHD symptoms from;
http://en.wikipedia.org/wiki/Attention-deficit_hyperactivity_disorder
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1. Often forgetful in daily activities.
Example: Obama says he doesn’t pay much attention to McCains campaign adds, yet he knows what isn’t in them,
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2. Often has trouble keeping attention on tasks or play activities.
Example: Joe Bidens observations;
Biden wasn’t always defending Obama...
http://firstread.msnbc.msn.com/archive/2008/07/17/1204594.aspx
On Aug. 1, 2007, when Obama unveiled his counterterrorism agenda, the Biden camp fired off a snarky email congratulating him for his “Johnny-come-lately position” on Afghanistan, noting that during two Foreign Relations Committee hearings on Afghanistan and other subjects, Obama didn’t ask questions about the Taliban, Al Qaeda, or Afghanistan.
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3. Often forgetful in daily activities.
Example: Obama says “ahhhhh” all the time when he isn’t scripted
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4. Often avoids, dislikes, or doesn’t want to do things that take a lot of mental effort for a long period of time (such as schoolwork or homework).
Example: Obama stayed less than 1 day in Iraq to study what was happening on the ground