The biggest question in Tuesday's primaries for U.S. Senate in New Jersey is not who will win, but how many will vote?

Ethan Miller, Getty Images

Democrat Cory Booker and Republican Steve Lonegan are the front-runners.

Their biggest challenge may be getting people to the polls for the unprecedented mid-August election.

Politics watchers say a mere 200,000 or fewer voters could decide the primaries.

The winners will compete in an Oct. 16 special election.

The victor heads to Washington to complete the final 15 months of Sen. Frank Lautenberg's term. Lautenberg died in office in June at age 89.

Gov. Chris Christie set the special election date three weeks before the Nov. 5 gubernatorial election.


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