Slate provides more from Artur Davis on absentee ballot fraud:

“Anyone who is even a casual observer of Alabama politics, however, knows quite well the frequency of absentee ballot charges and convictions within counties in the congressional district I represented, specifcially Hale, Greene, Lowndes, Perry, and the Bessemer areas within Jefferson County.”

and more:  “Law enforcement authorities in Alabama are well aware of many of the most notorious practitioners of absentee ballot fraud,” he said. “Should they build a case they have every ability to contact me or any other candidate so that they can weigh for themselves the value of the information.” Anyway, why not start with the evidence already out there? “I am a little mystified as to the point that no one is prosecuted for manufacturing ballots; it is a relatively common event in Alabama and has produced a number of cases and convictions, as well as guilty pleas: you can ascertain this for yourself by running a search engine for the last decade on voter fraud in Alabama.”