Breitbart writes, Bob Woodward has revealed that a "senior" White House official warned he would "regret challenging them" with a story about the origin of sequester. Given how Woodward earned his stripes as a reporter, the White House must have felt the issue was very important indeed. Woodward revealed an email he received from the White House about his sequester story, which argued that the White House had originally proposed the plan and was moving the goal posts for political reasons. Video of an interview Woodward gave to Politico shows him making the claim. He apparently said the same thing on CNN a few…