@okie,
Nah.
Point is: you're opposing Obama because he is a Democrat. You're opposing Obama's policies because he's a Democrat. If Obama was a Republican, or if it was a Republican doing the exact same things, you'd be all in favour of them.
That's certainly one way of being consistent.
What you're missing is that people who were opposing Bush for invading Iraq don't necessarily have the same hyper-partisan mindset. There are actually people who thought that the military intervention in Afghanistan and going after bin Laden was justified, but that the neoconservative agenda of invading and occupying Iraq had absolutely nothing to do with that.
Therefore, it's absolutely consistent to support the intervention in Afghanistan (whether it was under Bush or now under Obama) and, at the same time, oppose the intervention in Iraq (even though, at least in my opinion, the "you break it, you own it" rule applies, and the US have become responsible for the reconstruction of Iraq).