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Washington • Support for legal abortion in the U.S. has edged up to its highest level in the past two years, with an Associated Press-GfK poll showing an apparent increase in support among Democrats and Republicans alike over the last year.

Nearly six in 10 Americans — 58 percent — now think abortion should be legal in most or all cases, up from 51 percent who said so at the beginning of the year, according to the poll. It was conducted after three people were killed last month in a shooting at a Planned Parenthood clinic in Colorado.

But just over a third of Americans want laws on abortion to be stricter than they are now, the poll shows, while a quarter think they should be less strict.

While support for legal abortion edged up to 40 percent among Republicans in this month's poll, from 35 percent in January, the survey found that the GOP remains deeply divided on the issue: Seven in 10 conservative Republicans said they want abortion to be illegal in most or all cases; six in 10 moderate and liberal Republicans said the opposite.

Count Victor Remdt, 55, of Gurnee, Illinois, among the conservatives who think abortion should be illegal in most cases. He's adopted, and says he "wouldn't be here talking" if his birth mother had opted for abortion rather than adoption. Remdt said he'd like to see abortion laws become more restrictive but adds that he's not a one-issue voter on the matter.

John Burk, a conservative Republican from Houston, Texas, is among those whose position on abortion is somewhere in the middle. He reasons that banning the procedure would only lead to "back-alley abortions." But he's open to restrictions such as parental notification requirements and a ban on late-term abortions.

Burk, 59, a computer programmer, said he tracks his beliefs on the issue to his libertarian leanings and the fact that he's not religious. He doesn't see the nation coming to a resolution on the divisive issue any time soon, saying hard-liners on both sides of the question are entrenched and "they're never going to change."

Among Democrats, 76 percent of poll respondents now think abortion should be legal all or most of the time, up slightly from 69 percent in January.

Independents are more evenly split, with 54 percent saying abortion should be legal all or most of the time, edging up from 43 percent in January.

For Larry Wiggins, who describes himself as a liberal Democrat from Henderson, North Carolina, legal access to abortion should be — but isn't — a settled matter.

"A woman has the right to decide what she wants to do with her body," he said flatly. "I don't think the government has the right to interfere."

Nefertiti Durant, 45, an independent voter from Columbia, Maryland, sees abortion as more complex matter. She thinks a woman should have the right to choose abortion, but she's "not so keen on the fact that just anybody can go and have an abortion."

All of the Republican presidential candidates say they favor restricting abortion rights. The Democratic candidates support broad abortion rights.

Interest in the issue picked up this year after anti-abortion activists began releasing undercover videos that they said showed Planned Parenthood personnel negotiating the sale of fetal organs. Planned Parenthood said any payments were legally permitted reimbursements for the costs of donating organs to researchers. It has since stopped accepting even that money. Republicans have sought to cut off federal funding for Planned Parenthood. Several GOP-governed states have tried to block Medicaid funding to the organization.

Overall, the poll found, 45 percent of Americans have a favorable opinion of Planned Parenthood, and 30 percent have an unfavorable opinion. A quarter said they don't know enough about the organization to say.

The AP-GfK poll of 1,007 adults was conducted online Dec. 3-7. The margin of sampling error for all respondents is plus or minus 3.4 percentage points.