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Ahead on the 6/29 Maddow show

Tonight's guests include:Sen. Sherrod Brown, (D) OhioMike Weinman, director of Government Affairs for the Fraternal Order of Police in Ohio Rep.

Tonight's guests include:

Sen. Sherrod Brown, (D) Ohio

Mike Weinman, director of Government Affairs for the Fraternal Order of Police in Ohio

Rep. Ed Markey, (D) Massachusetts and ranking member of the House Natural Resources Committee

Executive producer Bill Wolff will now tell us what to expect on tonight's show: