"Hilarious!" — Jake Tapper, ABC News "Hilarious!" — Karen Tumulty, TIME "Hilarious!" — Erin Moriarity, CBS News  In March of 2009, Doonesbury‘s intrepid journalist Roland Burton Hedley, III, opened a Twitter account and began to tweet. A lot. Four weeks later, a sampling of his 140-character missives was published in The New Yorker to great…