Barack Obama appears destined for the largest California victory of any presidential candidate since World War II, potentially boosting prospects for Democratic candidates statewide.

In a new state Field Poll, the presidential ticket of Obama and Delaware Sen. Joe Biden leads Republican John McCain and running mate Sarah Palin by 55 percent to 33 percent.

If the margin stands on Nov. 4, Obama will rack up a California landslide more lopsided than that of Democrat Lyndon Johnson in 1964 or Republican Ronald Reagan in 1980 and 1984.

Field Poll director Mark DiCamillo said the sample of 966 likely California voters taken one week before Election Day shows gains for Obama amid intense dissatisfaction with President Bush and increasingly negative voter impressions of McCain and Palin.

"Voters are looking at an incumbent president with an historic low job approval rating. They strongly believe the country is moving in the wrong direction and have tremendous dissatisfaction," DiCamillo said. "They want to change the present administration, and McCain is seen as a little too close to that."

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