Baton Rouge, La. • The Louisiana state legislature on Wednesday passed one of the country’s strictest abortion bans, advancing the bill to the Democratic governor John Bel Edwards, who, like a coterie of conservative executives before him, has said repeatedly he would sign it.

Louisiana's measure is the first of the drumbeat of bans this year to receive the imprimatur of prominent local Democrats, whose support for the controversial legislation has provoked anger from party members nationwide who see it as a betrayal in the battle over abortion rights.

The Wednesday vote came after an ardent debate over amendments to the bill, including one that would have added an exception to the abortion ban for cases of rape and incest. That change, and others that sought to make the law more lenient, were rejected. After nearly two hours, 79 lawmakers voted to pass the bill, while 23 voted against it.

More than a dozen Democrats supported it.

"As I prepare to sign this bill," Edwards said in a statement after it passed, "I call on the overwhelming bipartisan majority of legislators who voted for it to join me in continuing to build a better Louisiana that cares for the least among us and provides more opportunity for everyone."

Nationally, however, Edwards, state Sen. John Milkovich, the Democrat who sponsored the bill, and other antiabortion Democrats have become the unlikely intraparty combatants in a debate that has grown increasingly partisan.

As the party has shifted left in recent decades, its leaders have increasingly signaled that members who oppose abortion rights are fundamentally out of step with the Democratic platform.

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Since the Reagan presidency, the issue has become increasingly divisive, especially among judicial confirmations, said Sherry Colb, a professor at Cornell Law School. Now, parties tend to use a judge's stance on abortion as a litmus test to decide whether they'll support a particular nominee, she said.

But, in Louisiana, antiabortion sentiment has long been part of the cultural milieu. The issue isn't nearly as divisive as it is on the national stage.

The legislation, a so-called “heartbeat” ban, resembles other bills passed this year in deep red states that could outlaw abortions after an ultrasound is able to detect the electric pulsing of what will become a fetus’s heart, a milestone that can come at six weeks - before some women even know they’re pregnant.

If signed, the six-week ban would join a number of antiabortion laws already on the state's books, many of which made it there with bipartisan support.

In 2006, a Democratic state senator sponsored a "trigger law" that would automatically ban abortions, except when birth threatens a mother's life, in the event that the Supreme Court ever overturns its Roe v. Wade decision. Gov. Kathleen Blanco, also a Democrat, signed it into law, ensuring Louisiana would be among the first states to outlaw abortion should the high court reverse course.

The state also prohibits public funding for abortions, and most private insurers there don't cover them, which means the procedure can be costly. Other laws, like requiring women to undergo an ultrasound and submit to a mandatory, pre-scripted counseling session, have also made abortions less accessible, particularly for those who must travel to a clinic from afar.

Another measure making its way through the legislature would let the public vote on a constitutional amendment that would prevent the state from protecting the right to an abortion or requiring funding for it.

The bill's sponsor, State Rep. Katrina Jackson, another Democrat, said in an interview with The Post before the vote that she plans to support the six-week ban, too. Her party's preferences are no match for her own deeply-held religious beliefs.

"I don't believe in being a cookie-cutter legislator, which means, you say, 'Oh, what's the party doing?' she said. "When you have a sincerely held belief, you stand for that belief. That doesn't mean you abandon your party. That doesn't mean that you abandon anyone. That means that you understand that a one-size-fits-all approach to legislature doesn't work."

Discussion of a new ban and the laws already in action have "made Louisiana an extremely hostile place" for women trying to obtain abortions, and for doctors trying to provide them, said Michelle Erenberg, the executive director of Lift Louisiana, which advocates for women's health and abortion access.

The state's three remaining abortion providers have already begun receiving calls from women asking whether abortion is still legal, she said.

"Things have become incrementally worse, and then suddenly catastrophic," said Katie Caldwell, the clinic coordinator at Women's Health Care Center in New Orleans.

The Louisiana branch of the American Civil Liberties Union said in a statement that "Louisiana politicians have now sunk to a new low."

The ban, should he sign it, won't go into effect right away - and may even end up languishing for years in legal purgatory. It will only take effect if a federal court upholds a near-identical ban in neighboring Mississippi. Just like other bans, Mississippi's has faced vigorous legal challenges. On Friday, a judge temporarily blocked it.

And earlier this year, another federal judge halted Kentucky's similar six-week measure, questioning the law's constitutionality. All the bans are part of a barrage of new restrictions - largely in states in the South and the Midwest - championed by religious conservatives and meant to spark a court fight that would challenge Roe, which legalized abortion nationwide in 1973.

Before any of the cases makes it to the Supreme Court, an appeals court judge would have to defy federal precedent and uphold one of the bans. The process could take years, and on Tuesday, the justices issued a compromise decision on an Indiana law that signaled they might proceed slowly on other abortion cases.

In Louisiana, the nation is seeing some of the last remaining "pro-life" Democrats, a class of politician that has become obscure in recent decades.

Edwards has been a high-profile member of it since he was elected governor in 2015. Like other antiabortion Democrats, he likes to say he's "pro-life for the whole life," because he opposes abortion but supports policies like Medicaid expansion and a higher minimum wage.

The Army veteran and devout Catholic has said he traces his long-held views on abortion to his faith - and so do many of his constituents, he said.

"That's the way I was raised," Edwards said in an October 2018 episode of his monthly radio show. "I know that for many in the national party, on the national scene, that's not a good fit. But I will tell you, here in Louisiana, I speak and meet with Democrats who are pro-life every single day."

But one of Edwards' fellow Democrats, Rep. Royce Duplessis, disagrees with his governor's stance. In an interview, he said the government has no right to interfere in decisions about a woman's health care and that this bill "absolutely goes too far." He opposes it, he said, and it wasn't about the national party's marching orders.

"It has nothing to do with party for me," he said. "It has nothing to do with party lines for me. I tend to stay consistent with what I believe, and that's respect for women, respect for women's health."

Countrywide, Democratic voters are more in line with Duplessis than with antiabortion lawmakers like Edwards, Milkovich and Jackson.

Today, more than two-thirds of Democrats believe abortion should be legal in all or most cases, a number that has increased by 20 percent since the mid '90s, according to Pew Research Center. But this shift has left some more conservative lawmakers and voters, whom the party had long welcomed, feeling alienated.

It's yet another example of phenomenon so often observed it has become a cliche: the country's political parties are more polarized, the electorate more divided.

“It’s almost like the Democratic Party is this club, and there are rules to this club. And you can’t violate the rules,” said Colb, the professor who clerked for Supreme Court Justice Harry Blackmun, the author of the Roe decision. “There’s a sense that we’re not going to tolerate intolerance.”