Sen. Cory Booker is the latest Democrat to announce his support for the Iran nuclear deal.
He's siding with President Barack Obama despite home-state pressures to say "no."
Sen. Booker says in a statement that the deal is flawed, but the alternative is worse.
On Wednesday, Senate Democrats clinched the needed votes to uphold Obama's veto, if necessary, of a resolution of disapproval that Republicans are trying to pass this month.
Sen. Booker becomes the 35th Democratic or independent senator to back the deal.
The agreement negotiated by the U.S. and other world powers aims to curb Iran's nuclear program in exchange for relief from economic sanctions.
Sen. Booker had been closely watched because of pressures from New Jersey's Jewish community to oppose the deal.
Sen. Bob Menendez opposes the deal.
The Associated Press wire services contributed to this report.