[cnn-photo-caption image=http://i.cdn.turner.com/cnn/2010/POLITICS/03/01/jerry.brown.profile/story.jerry.brown.gi.jpg caption="Jerry Brown, the once and future California governor? The current state attorney general leads in polls." width=300 height=169]
John Helton and Ed Hornick
You could make a serious argument that Jerry Brown is the most unconventional politician America has ever known.
On Tuesday, he's expected to defy convention again, announcing that at age 71 he's running for governor of California, an office he left almost three decades ago.
Three sources told CNN on Monday that Brown will announce on Tuesday that he's running.
Brown has run three times for president and once for the U.S. Senate. After leaving the governor's mansion in 1983, he started over, serving as the state party chairman, hosting a radio talk show - in which he routinely referred to himself as a "recovering politician" - serving two terms as mayor of Oakland and is currently the state's attorney general.
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