When Bernie Sanders moved last April to block a U.S. arms sale to Israel, only 14 Democratic senators joined the Vermont independent.

What a difference a year makes: When Sanders objected to another Israeli arms sale this month, 39 other members of the Senate Democratic Caucus joined him — a sea change that has raised eyebrows from Washington to Jerusalem.

In a recent interview, Sanders reflected on the sudden and massive shift, one that has some observers saying he — not Senate Minority Leader Chuck Schumer, who has voted to support the arms sales — is leading Senate Democrats on Israel policy.

“That’s true,” Sanders said of the claim. “I mean…

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