Because the Left has seized higher ground on the wider blogosphere, the Right has turned its focus to Twitter, and Rob Neppell's TCOT has helped them organize things like the aforementioned Tea Parties. Of course, this is why the Right went to the blogosphere eight years ago: they perceived the mainstream media as being controlled by the Left. There is obviously a pattern here, and it owes to the Right often considering itself in an oppositional role to the prevailing culture. (This is the same reason why the right-wing editorial positions of thetabloid New York Post and tabloid-y Fox News are so compelling; being oppositional is controversial and being controversial is fun.)
The Right's Twitter
It seems the Right has been jumping on the Twitter bandwagon at a faster rate than the Left—whether that's a good thing (for the Right) or not remains to be seen.