Scott Brown was the Tea Party’s first big electoral coup. Then Ted Kennedy’s successor began siding, again and again, with Barack Obama—and now, as Andrew Romano reports in this week’s Newsweek, some in his own party want to oust him. Scott Brown isn't himself. Which is to say, he isn't sounding much like the square-jawed, truck-driving, barn-jacket-bedecked Scott Brown—the calm, cool, collected Captain America—who stunned the political world a year ago by winning the special election to replace Ted Kennedy in the U.S. Senate. [SNIP] The strain of walking such a fine line must be getting to Brown, because as...