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Ahead on the 7/30 Maddow show

Tonight's guests include:John Harwood, chief Washington correspondent for CNBC and political writer for The New York TimesRichard Muller, professor of physics a

Tonight's guests include:

John Harwood, chief Washington correspondent for CNBC and political writer for The New York Times

Richard Muller, professor of physics at University of California, Berkeley, founder of the Berkeley Earth Surface Temperature project and self-professed longtime “climate-change skeptic” who now admits he was wrong

Here's tonight's soundtrack.

And here's executive producer Bill Wolff with a preview of tonight's show: