Newark mayor Cory Booker has raised more than $2 million for his U.S. Senate race in the last month alone, and had five TV ads saturating the airwaves before any other candidate had released one.

Two of Booker's ads are in Spanish. 

Veteran Congressman Rush Holt didn't release his first TV ad, running in New York and Philadelphia markets, until this week - seven days before the primary. Congressman Frank Pallone's TV ad hit the airwaves at the end of July. 

Sheila Oliver's campaign is running digital ads. 

The Senate primary is Tuesday, August 13th.