I'd be surprised if Santorum won TN-9, in 2008 McCain won the district despite Huckabee winning the county, this seems like a similar situation.
Very plausible.
Without any other information, my proxy would be the votes for the individual delegates in a given district; if Gingrich did well, Santorum probably did too. However, in TN-9 not even Gingrich had a slate of delegates.
Shelby County's election returns website is hilarious, by the way.
I got the report from the Election Commission - Romney did win TN-9 which should give him 2 delegates and Santorum one.
