The left has usually used Twitter to promote ideas, according to Alan Rosenblatt, of the Center for American Progress Action Fund. "We have a lot of amazing progressives on Twitter," he told Maine's online news source, the Exception. But, he added, there had been "nothing that brings everyone together."
By contrast, he said, the right has been using Twitter to create new pressure points in politics. Conservatives have a website, Top Conservatives on Twitter, that ranks various right-wing tweeters (former House Speaker Newt Gingrich currently rides on top), and offers pointers on how to organize.
This interesting Los Angeles Times blog post analyzes Twitter usage from liberals and conservatives, ultimately noting "conservatives seem to be having more fun with Twitter." Senator John McCain reached one million followers six weeks before The White House. The LA Times reports: