In 1983, Mattox was indicted for commercial bribery and prosecuted by Travis CountyDistrict AttorneyRonnie Earle, a Democrat close to the late Governor Ann Richards. Earle later prosecuted the Republican congressional leader Tom DeLay. Like the DeLay prosecution, the political background of the Mattox prosecution related to an attempt to conceal the delivery of corporate funds to an election campaign. Mattox had received a campaign contribution of $125,000 from his sister Janice, a Dallas lawyer. Janice Mattox, in turn, had obtained a similar amount from Seafirst Bank in Seattle, which had close ties to Mattox supporter Clinton Manges, a controversial South Texas rancher-oilman who was the successor to George Parr, the corrupt "Duke of Duval". Manges was co-plaintiff with the state (represented by Mattox) in major litigation against Mobil Oil Company. Mobil had attempted to depose Janice Mattox concerning the Seafirst transaction, which led Mattox to threaten Mobil's law firm, Fulbright & Jaworski, with loss of its tax-exempt bond practice, a power held by the attorney general in Texas. Secretly recorded by the recipient of the threats, Mattox did not deny threatening the law firm, nor did he deny the Seafirst transactions, his defense being based on the legal definition of the crime of "commercial bribery". After a long trial, Mattox was acquitted.
His aggressive attacks on alleged wrongdoing by corporations gained him considerable popular support.
In 1989, Mattox was inducted into the Woodrow Wilson High School Hall of Fame.
Challenging Ann Richards, 1990
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Failed comeback attempts, 1994 and 1998
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Advocate for Ending the Texas Two-Step
Five days before his death, Jim Mattox testified to a Texas Democratic Party Committee on the Party's method of awarding presidential delegates based on a primary vote plus evening caucuses. Mattox said the system, known as the Texas Two-Step, was an embarrassment to the party. "Now let me tell you, folks," Mattox said. "This system we've got is an expensive system. It's an unintelligible system. It is an acrimonious system across the board. It is subject to misconduct, it is subject to fraud, it is subject to manipulation. It's unfair, it's uncertain, it's inaccurate, and it's an embarrassment to our party."
Mattox's body lay in repose at the Texas House of Representatives chamber inside the Texas Capitol rotunda on Monday, November 24, 2008. Services were held on Tuesday, November 25, 2008 at the First Baptist Church, 901 Trinity Street in Austin. He is interred at the Texas State Cemetery, 909 Navasota Street in Austin.
References
^April Castro, "Mattox, a tough foe, dies at 65", Laredo Morning Times, November 21, 2008, p. 1