News that the U.S. Postal Service’s financial picture is improving (although it’s all relative when you still post a $740 million quarterly loss) reminded FedLine of a recent inspector general’s report looking at one roaring success: political mail. This will come as no surprise to anyone who had to empty a mailbox in a battleground state, but last year’s general election was a huge winner for the USPS bottom line. In comparison with the 2008 election season, revenue from a torrent of candidate and other political mailings more than doubled to $508 million, far beyond the initial goal. This was not happenstance, as the Postal Service had…