This web- and Twitter-savvy move (he uses the word “retweet”!) is the most immediate piece of a digital campaign strategy that also includes a YouTube channel, a Facebook presence, a Flickr account and a Digg profile, all lined up in the footer of every page on his Web site. Visitors are also urged to sign up for an email newsletter.

Campaign 2.0 was ushered into existence by Barack Obama’s brilliant campaign manager, David Plouffe, who really set the gold standard, even though Twitter wasn’t a part of his strategy. The microblogging powerhouse wasn’t at quite the same level of omnipresence a year and a half ago as it is today.

One of Twitter’s most persistent qualities is its malleability, lending it to any number of creative applications users can invent and implement. Of course, Twitter is the tool, not the strategy–next election cycle, there will no doubt be a new shiny new app to play with. But for now, It will be interesting to see if Newsom’s camp does something creative with this one.

This morning the DOJ approved the merger of satellite radio companies Sirius Satellite Radio (SIRI) (home to Stern) and XM Satellite Radio (XMSR) (home to Winfrey), a move that will create a satellite radio company with about 14 million subscribers.

In a statement, the DOJ said it found no reason to think that combining the only two satellite radio players in the market would create a pay-radio monopoly. “After a careful and thorough review of the proposed transaction, the division concluded that the evidence does not demonstrate that the proposed merger of XM and Sirius is likely to substantially lessen competition, and that the transaction therefore is not likely to harm consumers,” the DOJ explained.

“The Division reached this conclusion because the evidence did not show that the merger would enable the parties to profitably increase prices to satellite radio customers for several reasons, including: a lack of competition between the parties in important segments even without the merger; the competitive alternative services available to consumers; technological change that is expected to make those alternatives increasingly attractive over time; and efficiencies likely to flow from the transaction that could benefit consumers,” said the DOJ.