Many Democrat legislators are pushing for late term abortions, which places them on the wrong side of popular opinion.
Who? How many?
It has been that way for a while. Democrats favor late term abortions.
On a national level in 1998 there was the HR 1122 - Partial-Birth/Late-Term Abortion bill which seeked to ban the practice of partial abortions where the fetus is partially delivered and aborted.
https://justfacts.votesmart.org/bill/2858/8202/156/partial-birthlate-term-abortion-billVote Smart's Synopsis:
"Vote to pass a bill that prohibits any individual from knowingly performing a procedure, in which a fetus is partially delivered before it is aborted, unless the life of the woman is endangered by a physical disorder, illness, or injury."

In 2015 Democrats again also voted against a bill to ban late term abortions:
Earlier this year in February 2022, Senate Majorty Leader Chuch Schumer introduced a bill into the Senate, that was passed by the House in Sept 2021, to codify abortion at all stages.
https://www.frc.org/updatearticle/20220225/dems-abortion"On February 28, Senate Majority Leader Chuck Schumer (D-N.Y.) will bring the Abortion on Demand Until Birth Act, otherwise known as the Women's Health Protection Act (WHPA, S. 1975), to a vote. This legislation codifies Roe v. Wade's precedent of legal abortion through the entirety of pregnancy. The bill passed the House in September and needs 60 votes in order to pass the Senate. If the bill does pass and is signed into law, it will become the first-ever piece of federal legislation legalizing the killing of an unborn child."
Surprise, surprise, at the end of the previous year in September of 2021 House Democrats had voted in favor of it on a nearly party line vote.
https://www.cnn.com/2021/09/24/politics/house-vote-women-health-protection-act/index.html(CNN) The House on Friday passed the Women's Health Protection Act, a bill aimed at preserving access to an abortion nationwide, as abortion rights are being threatened across the country by Republican-led state legislatures.
The House passed the measure on nearly a party-line vote, with Democratic Rep. Henry Cuellar of Texas voting with Republicans against the measure. The vote was 218-211.
Democrats love late term abortion. You can find a similar Democrat voting record on a state level by looking for late term abortion bills by state.
Democrats are always the ones who vote in favor of late term abortions.
Democrats are always the ones who introduce bills for late term abortions.
Democrats are always the ones who vote against bills banning late terms abortions.
That is just the way it is. Late term abortions are a Democrat staple item.