TRENTON - A New Jersey court has ruled the special U.S. Senate election to decide who will replace late Sen. Frank Lautenberg can be held in October.

Gov. Chris Christie scheduled the election for October 16.

Democrats filed a lawsuit, saying the vote should be held on Election Day, when voters are going to the polls anyway. The New Jersey Superior Court rejected the challenge.

Four Democrats and two Republicans have filed petitions to run for the U.S. Senate seat, with Newark Mayor Cory Booker considered in some circles to be the frontrunner.