For decades, Catholic Democratic politicians have been justifying their pro-choice position by telling us that they were personally opposed to abortion but could not impose their religious view on others. For most, the argument was a fig leaf to justify their shameful failure to protect innocent unborn life. But it appeared that Joe Biden really believed it.

For more than 40 years, Biden supported the Hyde Amendment, which bars federal funding for abortions. In 1994, when a constituent wrote to Biden, urging him, "Please don't force me to pay for abortions against my conscience," Biden replied, "I agree with you." He pointed out that he had voted no fewer than 50 times against federal funding of abortions, promising, "Those of us who are opposed to abortion should not be compelled to pay for them." In his 2007 book "Promises to Keep," Biden wrote, "I've stuck to my middle-of-the-road position on abortion for more than 30 years."

But middle-of-the-road is no longer good enough in today's Democratic Party. So when Biden recently reaffirmed his support for the Hyde Amendment, his opponents for the 2020 Democratic presidential nomination pounced.

PENNY NANCE: ON ABORTION, JOE BIDEN HAS ABANDONED HIS CONSCIENCE IN A DESPERATE SEARCH FOR VOTES

"There is #NoMiddleGround on women's rights," Sen. Bernie Sanders, I-Vt., tweeted. "Abortion is a constitutional right."

Sen. Kamala Harris, D-Calif., chastised Biden, declaring "No woman's access to reproductive health care should be based on how much money she has. We must repeal the Hyde Amendment."

Biden's surrender to the pro-abortion radicals damaged his presidential prospects.

Sen. Elizabeth Warren, D-Mass., and a number of other Democrats also piled on, as did Planned Parenthood, NARAL and Emily's List.

As recently as last week, the former vice president was still standing firm. It appeared this might be his "Sister Souljah moment," when he separated himself from the extremists in his party. This was both principled and good politics: Just 36 percent of Americans support federal funds to pay for abortion.

But then Biden gave in to the mob. He tried to justify his flip-flop at a Democratic National Committee event in Atlanta on Thursday night by declaring, "If I believe health care is a right, as I do, I can no longer support an amendment that makes that right dependent on someone's ZIP code." This is absurd. Americans have a constitutional right to keep and bear arms, but the government is not obligated to provide weapons to poor people who cannot afford them.

Biden's surrender to the pro-abortion radicals damaged his presidential prospects. First, it made him seem weak and unprincipled. Few pro-choice voters would have abandoned Biden because he opposed taxpayer-funded abortion; indeed, plenty of pro-choice voters agree with that position. But voters will abandon a politician who abandons his principles.

Second, it hurt Biden with the one group he claims he can win back for Democrats: working-class voters who cast their ballots twice for him and President Barack Obama, but switched to Donald Trump in 2016. These once-reliable Democratic voters are more socially conservative than the liberal elites. Abortion radicalism doesn't appeal to them.

Third, Biden's capitulation refocused the national spotlight on abortion extremism in the Democratic Party. After Alabama passed the most restrictive abortion law in the country, Democrats thought they had the upper hand in painting Republicans as abortion extremists. But now the focus is back on Democrats and their insistence on taxpayer-funded abortion-on-demand up to the moment of birth. In New York, Democrats just lit up the Freedom Tower to celebrate the passage of a new law that removes most restrictions on abortion, even in the third trimester, and in Illinois, the legislature just voted to repeal the state's Partial Birth Abortion Ban Act. As a senator, Biden consistently voted against late-term abortions. Will he cave on that as well?

Democrats don't seem to understand that most Americans — including many who identify as pro-choice — don't see abortion as something to celebrate but as a necessary evil that should be allowed only in some limited circumstances. A Marist-Knights of Columbus poll found that just 13 percent say abortion should be available at any time during a pregnancy, while 80 percent say it should be allowed only during the first trimester; in cases of rape, incest or to save the life of the mother; or not allowed at all

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A new NPR-PBS NewsHour-Marist poll finds that a 38 percent plurality believes life begins at conception, while a 75 percent supermajority says it begins at the point of viability at the very latest. A majority of Americans support restrictions on abortion and oppose federal funding.

Sadly, Biden has aligned himself with the radical minority. He should be ashamed.

CLICK HERE TO READ MORE BY MARC THIESSEN