Vice President Biden might have had the late Sen. Frank Lautenberg (D-N.J.) on his mind Thursday at the swearing-in ceremony for former Newark Mayor Cory BookerCory Anthony BookerChris Murphy’s profile rises with gun tragedies Lawmakers target third-party ticket websites Overnight Health Care: Trump unhappy with Price over private jet use | Trump to allow insurance plans to be sold across state lines | Dems want probe into ObamaCare website shutdowns MORE (D).

The VP was overheard referring to another Garden State politician with a one-syllable first name, Sen. Bob MenendezRobert (Bob) MenendezOvernight Health Care: House passes 20-week abortion ban | GOP gives ground over ObamaCare fix | Price exit sets off speculation over replacement You want to recall John McCain? Good luck, it will be impossible Poll: Most in NJ want Menendez to resign if found guilty MORE (D), as “Frank” while Booker was being sworn into the Senate.

"Come on up here, Frank," Biden said to Menendez, before correcting himself, "Bob."

Just moments earlier, Biden noted that Senator-elect Booker won the vote to replace Lautenberg, who died in June at the age of 89.