I'm assuming the rack mounts on the windshield brackets? How about drilling a small hole in the rack and snaking the wire from the hood cowl, into the tubing, up to the top. It will be a pain in the butt but look really good and clean
I agree with the snaking it through the pipe, I did that for my bumper lights and can only tell if you are right up next to it. It is a severe pain in the butt. Get a piece of baling wire long enough to snake through there feed it up and loop your wires on it and pull it down. It's worth it.
Machine guns get the job done, but us snipers do it with finesse!