The 2010 election is on November 2.  On September 10, Wisconsin promised the federal government that it will count votes mailed back by overseas absentee ballots in 2010 if they arrive as late as November 19.  See this story.  A new federal law in effect this year tells the states that they must mail overseas absentee ballots no later than 45 days before an election, but Wisconsin can’t comply with that law this year because its primary is so late.  The late date for allowing ballots to be received is a compromise measure, in effect this year only.  Thanks to Eric Garris for the link.