The spot, from American Commitment Action Fund, is a response to a pro-Booker ad launched by New York Mayor Michael Bloomberg's PAC this week that hails Booker as a "senator to get things done."
The organization's ad charges that money Booker solicited and received from Facebook founder Mark Zuckerberg to reform Newark's schools was wasted, and notes that the city's school system is still facing challenges.
“Cory Booker: Broken promises and a record of failure," the ad closes.
The spot is backed by a buy "in excess of six figures," according to an adviser to the group. Bloomberg's ad, supported by $1 million, dwarfs that.
And though recent polling has shown Booker to be in a tighter race than expected, it's unlikely that Republican Steve Lonegan, the former mayor of Bogota, N.J., would be able to pick up enough momentum in the final week of the campaign to overcome the fundamentals of New Jersey, which favor Democrats.