Until last summer, Charlie Camosy served on the board of Democrats for Life. But the Catholic professor of theological ethics said he stepped down when it became clear all the major Democratic presidential candidates had become too extreme for him on the issue of abortion.

“They were trying to make sure people like me were not welcome in the party,” said Camosy, who teaches at Fordham University in New York City.

Camosy, a registered independent who says he has voted for Democrats down-ballot but not for president in recent years, joined the American Solidarity Party last summer. The tipping point, he said, was when even Buttigieg, seen as more moderate by many voters, was “parroting” the language of the Democratic Party’s 2016 platform, which includes no restrictions to abortion access and opposes a long-standing measure — known as the Hyde Amendment — that prohibits the use of taxpayer money to pay for abortions.

In a recent survey of all the Democratic candidates, The Washington Post asked whether there should be restrictions on abortion at any point during a healthy pregnancy. Six of the candidates, including Buttigieg, Warren and Sanders, said they support no restrictions.