In another Web 2.0 showdown, the presidential campaigns are engaging in a debate Twitter style. The " face-off on Twitter sponsored by the Personal Democracy Forum" started on Friday and is expected to last at least until Tuesday night with the end of the organizations annual conference. The Obama camp will be represented by Mike Nelson a former Clinton Whitehouse staffer while McCain's campaign is represented by Liz Mair, communications director for the Republican National Committee. Time Magazine blogger Anna Marie Cox will moderate. Let's hope Twitter is up to the challenge! With all of Twitter's issues of late, you have to wonder whether or not this was a good move or simply one that they fealt could not be passed upon?