Micah Sifry suggests keeping an eye on Wikipedia.

“Sarah Palin’s Wikipedia page was updated at least 68 times the day
before John McCain announced her selection, with another 54 changes made
in the five previous days previous. Tim Pawlenty, another leading
contender for McCain’s favor, had 54 edits on August 28th, with just 12
in the five previous days. By contrast, the other likely picks — Romney,
Kay Bailey Hutchison — saw far fewer changes. The same burst of last-minute editing appeared on Joe Biden’s Wikipedia page, Terry Gudaitis of Cyveillance.”

“None of Wikipedia entries for the current candidates being bandied about
by Romney-watchers — Rob Portman, Marco Rubio, Paul Ryan, Bobby Jindal,
Chris Christie, Kelly Ayotte or Pawlenty — are currently showing
anything like the spike in edits that Cyveillance spotted on Palin and
Biden’s pages back in 2008. But most of those came in the 24 hours prior
to the official announcement.”

Taegan Goddard’s Political Wire