mememax - 8:44 am on Dec 12, 2011 (gmt 0)
Exactly as kobayashi said, I told you the way this should work. However (citating myself) "in my own experience, google editor will show me those keywords as duplicated. The only way you're sure to not activate double serving issues is to point to 2 different domains. Build a site for each region with its own campaign (or account if you prefer)."
Create two different domains like nycexample.com and laexample.com (being example your main keyword) and then create campaigns. If you want to be sure to not make duplicate content with those new site, noindex them or disallow the entire site with robots.txt and go with your geo-campaign.