New York (AFP) - US Congressman Seth Moulton is the latest candidate to drop out of the Democratic Party race for the White House, US media reported Friday.
The representative from Massachusetts becomes the fourth candidate to quit due to poor polling, narrowing the crowded field to 21.
"I think it's evident that this is now a three-way race between (Joe) Biden, (Elizabeth) Warren and (Bernie) Sanders, and really it's a debate about how far left the party should go," Moulton told the Boston Globe.
The 40-year-old is due to formally announce the end of his campaign in a speech to the Democratic National Committee later on Friday, The New York Times reported.
Moulton's departure comes after Washington Governor Jay Inslee pulled out on Wednesday.
California representative Eric Swalwell was the first to withdraw last month. He was soon followed by former Colorado governor John Hickenlooper.
Other withdrawals are expected ahead of a debate scheduled for September when participants will have to have recorded two percent in recent polls and have attracted at least 130,000 different donors across 20 states.
Only 10 candidates currently meet the criteria, according to RealClearPolitics.com.
Former Vice President Biden is leading the polls, followed by Bernie Sanders, Elizabeth Warren and Kamala Harris.