I had that problem once and lightly sanded the caliper where it touched. as the guy above says, if you go up to every spoke on the left of the wheel and loosen them exactly 0.5 turns and then tighten the spokes on the right by exactly 0.5 turns you'll be moving the rim over and the spokes will lean away from the caliper.....possibly....If the contact point is half way along the spoke it won't make any difference!
regards
Taffy