Backing for the nation-state of the Jewish people has historically been bipartisan, with Democrats being slightly more supportive.

But this has changed recently for several reasons.

First, Israel has moved more to the right as the result of demographic changes: increased immigration from former Communist countries and higher birth rates among ultra-Orthodox and Sephardic Jews.

And the refusal of Palestinian leaders to accept peace proposals has weakened the left.

Second, the Republican Party, especially its influential evangelical base, has become more supportive of Israel than old-line business-oriented Republicans used to be.

Finally, and most important, younger Democrats are moving to the left (and away from the increasingly conservative Israeli government).

And their decreasing support for Israel is not necessarily limited to the current government.

It may represent a fundamental turn toward the Palestinian narrative, which emphasizes “anti-colonialism” and other mantras of the left.

The diminishing support for Israel among the Democratic Party’s left wing coupled with the expanding support among Republicans has not yet had a discernable impact on American Jews, who still vote overwhelmingly for Democrats.

That’s because Israel is less central to Jewish voters’ identity than it used to be.

Other issues — such as choice, the environment, gay and transgender rights, gun control, separation of church from state — are at least equally important.

Indeed, Israel is more important to many Christian evangelicals than to some Reform and Conservative Jews.

Candidates reflect the views of voters, so our fear that Biden ends up the last Democratic candidate for president who strongly supports Israel may well prove accurate.

The likely future is a growing wedge between the Democrats and Republicans over Israel.

This poses a dilemma for longtime Democrats like us who do prioritize backing for Israel.

Should we remain within the Democratic Party and try to influence it away from its shift against Israel?

Or should we give up on the party we have supported for so long and help the party now on the Israel side of the wedge?

One of us (Alan) is planning to remain a Democrat and vote for Biden while seeking to marginalize the radical anti-Israel elements in that party.

The other (Andrew) has decided to vote for a Republican.

Others like us are making similarly painful choices.