Steve Westly, the Silicon Valley millionaire and former state controller who lost in last year's Democratic gubernatorial primary, plans to announce Tuesday that he will support the February ballot measure to modify term limits.
Westly's announcement pits him against another millionaire, Republican Insurance Commissioner Steve Poizner, who has pledged $1.5 million of his own money to defeat the measure.
Political observers say the showdown between deep-pocketed and
high-profile figures could be a preview of the 2010 governor's race.
The winner could score major points with his respective party.
Proposition 93 would let most current state lawmakers extend their terms in office by allowing them to serve 12 consecutive years in either the Senate or Assembly, rather than 14 years split between the two houses.
Democratic leaders of both houses support the measure, which has been losing ground in polls.