Jeff Van Drew concedes to challenger Zack Mullock in NJ's 2nd Congressional District Race

Democrat Zack Mullock is claiming victory after Republican incumbent Jeff Van Drew conceded in the race for New Jersey's 2nd Congressional District.

Gov. Mikie Sherrill was on hand to introduce Mullock late Tuesday night.

"This win made my night," Sherrill said.

Mullock said the win came as a surprise.

"I am so humbled. I can't believe this is happening - so much so I had to type something out really quickly," he said.

Van Drew conceded earlier in the evening.

"I've already conceded about 10 minutes ago, I called Zack Mullock and I conceded his victory. He is and will be our new congressman for the next two years," said Van Drew to supporters. "I wish him the very best. I wish him success. His success is our success."

The race has not yet been called by ABC News.

Van Drew had been seeking a fifth term.