Here is another tool for examining the NH primary results. It compares each candidate's hand-counted to machine-counted vote ratio with the overall ratio, and can limit the report to towns producing a certain range of votes (e.g. say you only want to consider medium-sized towns to factor out the urban-vs-rural issue).

Please consider that the real way to deal with the risk of fraud is for citizens to organize their own exit polling. The commercial exit polling is not truthful-- it is known that they adjust their results to the actual election outcome and do not make the raw data available.