When Jesus came, the elect (not the Calvinist doctrine of the elect, but the remnant of faithful Israel within the national Israel) received the gospel and the rest were blinded.
Why were they blinded? Because they did not believe on him whom God had sent.
He came to his own, and his own people did not receive him. But to all who did receive him, who believed in his name, he gave the right to become children of God, who were born, not of blood nor of the will of the flesh nor of the will of man, but of God. ~ John 1:11-13
This plays out in plain view in John 9 when the unbelieving, religious Jews expelled the man healed of blindness from the synagogue.
Jesus heard that they had cast him out, and having found him he said, “Do you believe in the Son of Man?” He answered, “And who is he, sir, that I may believe in him?” Jesus said to him, “You have seen him, and it is he who is speaking to you.” He said, “Lord, I believe,” and he worshiped him. Jesus said, “For judgment I came into this world, that those who do not see may see, and those who see may become blind.” Some of the Pharisees near him heard these things, and said to him, “Are we also blind?” Jesus said to them, “If you were blind, you would have no guilt; but now that you say, ‘We see,’ your guilt remains. ~ John 9:35-41
While men like the man born blind received salvation through Jesus, others like the Pharisees were blinded because of their unbelief. In Romans 11, Paul says, What then? Israel hath not obtained that which he seeketh for; but the election hath obtained it, and the rest were blinded. ~ v.7
The elect (election) is a reference to those within Israel, who like the man born blind had heart towards finding the truth, for when he was asked by Jesus, “Do you believe in the Son of Man?” He answered, “And who is he, sir, that I may believe in him?”
The Pharisees, on the other hand, had no desire to believe in him, but were rigorously opposed to Jesus because they loved the praise of men more than the praise of God (John 12:43), and in them was fulfilled the words of the prophet Isaiah: He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them. ~ John 12:40
It is unfortunate, that some within Christian ranks, especially among the “prophecy gurus” have made unbelieving Jews, who despise the gospel, the central focus of their end time theology. Yet God has a people among them. Not a people who will find him in a rebuilt temple, but who will find him through the hearing of the gospel.
God has a remnant with the Jewish people, and like the man born blind, they need to know who the Son of God is so that they can believe in him.