WASHINGTON — On paper, Representative Alan Grayson, a freshman Democrat from Florida, seems a bit stiff: degrees from Harvard and Harvard Law; a résumé that includes clerking for the United States Court of Appeals under Judges Antonin Scalia, Ruth Bader Ginsburg and Robert Bork; an advocate for the aging.

But in recent weeks, Mr. Grayson has catapulted himself to national renown for outlandish rhetoric and a pugilistic political style that makes him seem less staid lawmaker than a character on the lam from one of his Orlando district’s theme parks.

First it was his comment, “If you get sick, America, the Republicans’ health care plan is this: Die quickly.” Then, appearing on MSNBC, he said of former Vice President Dick Cheney: “I have trouble listening to what he says sometimes because of the blood that drips from his teeth while he’s talking.” Finally, a radio interview surfaced in which he had called a female adviser to the Federal Reserve chairman “a K Street whore”  a reference to her former job as a Washington lobbyist. That one forced him to make a formal apology.

Mr. Grayson could be the latest incarnation of what in the American political idiom is known as a wing nut  a loud darling of cable television and talk radio whose remarks are outrageous but often serious enough not to be dismissed entirely. Mr. Grayson is the more notable because he hurls his nuts from the left in a winger world long associated with the right.