It seems like only yesterday that New Jersey held a primary election — and yet another one is coming up in less than two months. 

There are four Democrats vying for the senate seat vacated by the late Frank Lautenberg: Assembly Speaker Sheila Oliver, Newark Mayor Cory Booker and U.S. Reps. Frank Pallone and Rush Holt.

Holt has been serving parts of central New Jersey since 1999, and is the son of a former senator from West Virginia.

Holt also holds a PhD in physics and is a former assistant director of the Princeton Plasma Physics Lab. Those titles led to a well known campaign bumper sticker that reads: "My Congressman IS a Rocket Scientist."  

Rep. Holt spoke with WHYY News Director Eugene Sonn.