By what percentage of vote margin did Ralph Northam win over Aneesh Chopra in the 2013 election for Governor of Virginia?

Context: Northam ran for Lieutenant Governor of Virginia in the 2013 election. Northam competed against U.S. Chief Technology Officer Aneesh Chopra for the Democratic nomination. On June 11, 2013, Northam won the Democratic primary over Chopra with 54% of the vote to Chopra's 46%.

On November 5, 2013, Northam was elected as Virginia's 40th Lieutenant Governor over Republican E. W. Jackson, receiving 55% of the vote to Jackson's 45%. Northam was the first Democrat since Tim Kaine in 2001 to be elected Lieutenant Governor of Virginia.

Answer: 8 percent