Krugman as a professional economist - years ago, prior to (IIRC) leaving MIT for Stanford, then going back to MIT and focusing more on NYT columns than the study of economics - was slightly left of center. No comment on his current standing...

For opinions from the other side of things, you can start with Walter Williams and Don Boudreaux (George Mason University) and Thomas Sowell at the Hoover Institute / Stanford University.