(cnn) - A new survey indicates that presidential candidate Sen. John McCain has made dramatic gains with California Republicans. The Arizona senator is 13 points ahead of his closest rival in a CNN/Opinion Research Corp. poll released Monday: Thirty-nine percent of likely California Republican primary voters back McCain, while 26 percent support former Massachusetts Gov. Mitt Romney.

For McCain, that's a 19-point jump in the polls since the last CNN/Opinion Research Corp. survey conducted in the state two weeks ago. Romney made gains as well, rising 10 points over the past two weeks.

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