"Current proposals that promote late-term abortion have reset the landscape and language on abortion in a pronounced – and very measurable – way," she said in a press release.
The numbers represent a significant change following a similar poll in January, with the largest shift in opinion registered among Democrats and people under the age of 45.
The number of Democrats calling themselves pro-life increased by 14 percentage points since January. Marist found that more than a third of Democrats (34 percent) say they are pro-life, up from one in five only a few weeks ago.
Over the same period, the proportion of Democrats identifying as pro-choice dropped from 75 percent to 61 percent. Political independents are split almost equally on the subject, with 46 percent saying they are pro-life and 48 percent pro-choice.
Young people also registered a broad change in opinion on abortion over the last month.
The February poll also showed a 19 point jump in pro-life identification among people under 45 years old. Forty-seven percent of people under the age of 45 now say they are pro-life, compared to 48 percent who say they are pro-choice.
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One month ago, only 28 percent of people under the age of 45 said they were pro-life.
Since January, the number of Americans who identify as pro-choice has dropped from 55 percent to 47 percent. The number of Americans who identify as pro-life increased from 38 percent in January to 47 percent in February.
Since the release of a similar poll in January,, New York and Vermont have both passed bills removing most restrictions on abortion and allowing abortion to take place throughout a pregnancy.