In one week, voters in New Jersey go to the polls in a special primary election for a U.S. Senate seat.
No one on the ballot has more name recognition than Cory Booker, the 44-year-old mayor of Newark, who is considered a rising star in the Democratic Party. But Booker's critics say he's been more focused on his own ambitions than on governing New Jersey's largest city.
In the seven years since Booker was elected mayor, he has been ubiquitous on Twitter and on TV.