The campaign said it raised $1.9 million from 2,300 contributors in the first three months of 2013. Sixty-five percent of the contributions were of $200 or less, the campaign said.

Booker's campaign said it ended the quarter with $1.6 million cash on hand.

"The support we’re seeing from people across New Jersey and around the country reflects the work Mayor Booker has done to make Newark a better place to live," Booker finance director Lauren Dikis said in a statement.

Booker is running for retiring Sen. Frank Lautenberg's (D-N.J.) Senate seat.

In March Booker's campaign brought on Kevin Griffis, who previously worked on President Obama's 2008 presidential campaign, as a senior communications advisor.