Schwarzenegger's endorsement will be added to earlier gestures by former governors Pete Wilson and George Deukmejian.
Jones is one of 10 Republicans vying for the chance to oust Boxer, long considered one of the nation's most-liberal senators.
Jones comes from California's conservative central valley and was a candidate in the 2002 gubernatorial primary. He also helped write the state's controversial "Three Strikes" law while serving in the state Assembly.
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