Threat Level has a story on the McCain campaign’s tracking of the Obama website. Nothing really new about the practice, and nothing stunning about the revelation that the Obama camp sometimes updates its website (gasp!), but what’s unusual is that instead of independent pundits doing this in their pajamas from their living rooms, this is now a tool being employed by the campaign itself.

The politicos’ mutual stalking has reached unprecedented new levels this year: At least one side has started to spider the other’s campaign website to track that campaign pages’ precise word changes up to an hourly basis.

John McCain’s campaign published a side-by-side comparison of Barack Obama’s Iraq War policy web pages on Tuesday using a new automated online tracking service called Versionista.