The significance of this should not be understated. This shows compelling evidence of real voter fraud that swayed the republican primary in Romney's favor and could easily sway a close general election.

Can anyone offer up a legitimate reason that the % of votes for a particular candidate should correlate with precinct size?

My friend summarized this, tl;dr;

"in the 2012 GOP Primaries Romney consistently outperformed expectations as precinct size increased, regardless of structural makeup of the precinct. The larger the precinct, the larger the out-performance. Similarly, GOP candidates have outperformed against democratic candidates."