The politics of abortion hasn't had much of an impact during the 2008 U.S. presidential campaign yet, a Gallup poll released Thursday indicates.

Once the primary-and-caucus season ends, the differences on abortion between presumptive Republican nominee Sen. John McCain of Arizona and the Democratic nominee may come into play, the Princeton, N.J., polling firm said.

Currently, just 13 percent of respondents said they would vote only for a candidate sharing their views on abortion, while another 49 percent said the issue would be one of many factors they'd consider, pollsters said.

Gallup's annual Values and Beliefs survey, updated May 8-11, indicated Americans as a whole -- 50 percent to 44 percent -- are slightly more inclined to call themselves pro-choice on abortion rather than pro-life, nearly identical to results over the past few years.

Gallup reported a majority of residents in the East and West are pro-choice, while the South is largely anti-abortion. The Midwest is evenly split.

Survey results were based on phone interviews with 1,017 adults conducted May 8-11. The sampling error is plus or minus 3 percentage points.

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