Some nine percent of voters claimed they had no specific preferences before the caucus.
The double-digit advantage of the former Secretary of State looks shaky considering the course of race. While the gap between the two stands at 12 percent as of Monday, an Emerson poll showed it was 18 percent on Friday, and 48 percent a month ago.
Sanders has taken a 30 percent bite of Clinton’s lead in New York since the middle of March. At the time he had 22 percent of New Yorkers behind him, and Clinton was supported by 71 percent of voters.
“I'm sure the Clinton camp was hoping for a much bigger lead in her adopted home state, but any such advantage appears to be limited against Sanders," said Patrick Murray, director of the Monmouth University Polling Institute, in a memo accompanying the poll results.
Before the New York primary Bernie Sanders won eight caucuses in a row, gaining his last victory in Wyoming, beating Clinton 56 to 43.8 percent.
“[W]e are closing very fast and now that Wyoming is behind us, we are here in New York state. I have been pleased to sense a great deal of momentum,” Sanders said at a press conference in the New York City borough of Queens. “No question in my mind, we have the momentum."