<p>The source of the memos is unclear. The sheer volume of the memos, however, suggests that the memos weren't simply misplaced by someone – they appear to have been intentionally leaked by a Democrat. Also, the memos, which begin in late 2001, cut off suddenly in April 2003. This suggests that they came from a former staffer, rather than someone who recently accessed Democrats' computers. Finally, the only information blacked out in the memos is staffers' names. Whoever leaked these memos did not care about the Senators, but apparently knew the staffers and cared enough to spare them embarrassment.</p>