RhinoFish - 8:23 pm on Dec 11, 2011 (gmt 0)
"the keyword with the highest rank" only comes into play when there is more than one eligible keyword. if you have no overlap between these 2 campaigns targeting, there cannot be a keyword in each one, at the same time, for one search, that is eligible to compete for the auction. the key to avoiding overlap is to understand BOTH facets of geo targeting, location and intent. have you looked at the advanced location options in each campaign's settings? the settings you choose there will affect how your geotargeting is working, you need to examine it. :-)
if you want more specific input, please make up a specific example.