Sen. Cory Booker, D-N.J., told NBC News there are “few candidates in history” as qualified as Hillary Clinton is to be president, making him the latest high-profile Democrat to endorse the former secretary of state.

More than 20 Democratic senators are already supporting Clinton's 2016 presidential run. Many of those endorsements came even before she officially kicked off her campaign earlier this month.

"There are few candidates in history who are as qualified or ready for the job of president as Hillary Clinton. I'm excited about her candidacy and her vision for our country," Booker said in a statement to NBC News on Thursday.

Booker was first elected to the Senate in a 2013 special election, but his social media savvy and frequent television appearances made him one of America’s most high-profile mayors when he was in charge of Newark, New Jersey. A Politico piece earlier this year reported Clinton advisers were already considering Booker as a possible vice presidential pick.