Why didn't Bush keep the war in Afghanistan?

The war in Afghanistan against Al Queda was relegated to second status when Bush invaded Iraq. He tried mightily to connect the two, but had to end up admitting Iraq had nothing to do with 9/11. We are still operating in Afghanistan, and recently bombed Al Queda targets in Somalia. We should have put our full force behind obliterating Al Queda, now that was a war I would have been behind all the way. But when we started getting fed garbage about Iraq being linked to 9/11, then found out that was b.s.? That's when I started questioning the agenda of George Bush. The question of why he did such a thing will be debated for many years. Some see it as a personal obsession with Iraq, some see it as faulty intelligence that linked the two. For me, I tend to think it was a combination of the two. Whatever the reason, we're stuck there now and it's clear that Bush is beating a dead horse. This next year will be the bloodiest yet, and I don't take pleasure in saying that, I think it's obscene.