My ac drain is clogged. I've tried everything to fix it. Unlike most drains mine goes into a pipe which I'm assumming runs through my foundation and drains into my main line. I'm at a point where it looks like my only other option is to rerun the ac drain and I really don't want to do that... any ideas?

"I've tried everything " we never know what that means so pardon us if we suggest something you already tried. I'd start with a shop vac. If you can reach the termination point use the vac to suck the line. If you can only reach the pan end then use the vac to blow air down the line. The clogs are frequently soft, wet lint and dust which is easily cleared. Once clear pour several cups of hot water mixed with vinegar down the line.

Can you absolutely be sure the obstruction is not in a p-trap (usual suspect) before it runs into the foundation? I know these types of setups are a pain and I use a special tip in a nitrogen tank to blow it out. I have seen CO2 cartridges that can do it too.

I would follow that pvc right to the foundation and eliminate any plug in it first. You can cut the pvc too with a hacksaw and blow it out with a hose and reglue with some pvc couplers. Very cheap.
If you know the obstruction is in the slab part than a blowout is needed or like the above advice, get a shop vac and have someone on it outside and someone inside covering the stub up with their hand if you have one. heres a quick vid on it. (http://www.youtube.com/watch?v=dkbsuo6w5aI)