Patrick Gavin at Politico highlights today Washington's most influential twitterers. "In Washington, the social networking and microblogging service is quickly becoming part of the daily media diet — and a powerful tool in the hands of those who are adept at making their points in 140 characters or fewer," he writes.

Washington’s 10 Most Influential Twitterers, according to Politico:

1. Karl

2. Sen. Claire McCaskill:

3. David Gregory:

4. Barack Obama:

5. Newt Gingrich:

6. Ana Marie Cox:

7. Sen. Chuck Grassley:

8. Joe Trippi:

9. Patrick Ruffini:

10. Al Gore: