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Francisco Kjolseth | The Salt Lake Tribune Senator Mark Madsen, R-Saratoga Springs, sponsor of the medical marijuana bill SB73 spe Rick Egan | Tribune file photo Utah state Sen. Mark Madsen R-Saratoga Springs, is bolting the Republican Party and is signing u Rick Egan | The Salt Lake Tribune Senator Mark Madsen R-Saratoga Springs, sponsor of the medical marijuana bill SB73 discusses