(reuters) - 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.

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.

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