ROSS DOUTHAT: For a brief shining moment, late in the 2008 campaign, Democrats thought that they might own the Internet. “A year later, some of the Democrats’ advantage is still there. But it’s been crumbling ever since Obama took office. Republican politicians have taken over Twitter. Sarah Palin has 1.2 million followers on Facebook. And in liberal Massachusetts, Scott Brown, the Republican Senate candidate, has used Internet fund-raising to put the fear of God into the Bay State’s establishment.”