(Agencies)
Updated: 2008-02-05 15:40

WASHINGTON - Democratic presidential hopeful Barack Obama surged to a big lead over Hillary Clinton in California hours before "Super Tuesday" voting began in 24 states, according to a Reuters/C-SPAN/Zogby poll released on Tuesday.

Democratic presidential candidate Barack Obama talks to the press on a flight from Wilmington, Delaware to Chicago, Illinois February 3, 2008. [Agencies]

In the Republican race, former Massachusetts Gov. Mitt Romney held a 7-point advantage on Arizona Sen. John McCain in California, while McCain added to commanding double-digit leads in New York and New Jersey.

On a sprawling day of coast-to-coast voting, the biggest ever in a US primary race, the US presidential contenders in both parties were fighting to win a huge cache of delegates to this summer's nominating conventions.

In California, which alone provides more than one-fifth of the Democratic delegates needed for the nomination, Obama led Clinton by 49 percent to 36 percent, the poll found. The margin of error was 3.3 percentage points.

Clinton pulled into a 5-point lead in New Jersey, 46 percent to 41 percent, after being tied on Monday. Obama held a 45 percent to 42 percent edge on Clinton in Missouri. Both polls had a margin of error of 3.4 percentage points.

Obama had a 20-point edge in Georgia, aided by a more than 3-to-1 lead among black voters.

Obama, an Illinois senator, and Clinton, a New York senator, are in a hard-fought battle for the Democratic presidential nomination and split the first four significant contests.

"There is clear Obama momentum in California," pollster John Zogby said. "But in New Jersey, things seemed to swing in favor of Clinton, and Missouri was very mixed."

In the Republican race, Romney maintained a stable 40 percent to 33 percent lead on McCain in California, fueled by heavy support in the southern part of the state and among self-described conservatives. The margin of error was 3.4 percentage points.

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