The war in Iraq is still the top issue for U.S. voters, a new survey has found.

However, growing anxiety over the economy, healthcare and immigration rival the war as the central issues in the ongoing presidential campaign, according to a USA Today/Gallop poll released here Wednesday.

At 36 percent, the war was raised twice as often as the next-ranking issue, the economy (16 percent), the poll shows.

But when domestic and economic concerns are combined, they are mentioned more often than the war, terrorism and foreign policy by9 percentage points.

That's the reverse of findings last spring, when war-related issues were cited more often.

"Barring a real transformation of the political situation in Iraq, Iraq will be one of the dominant issues" in 2008, said Andrew Kohut, director of the non-partisan Pew Research Center. "But the economy is coming on really strong."

The changing agenda is reflected on the campaign trail.

Democratic candidates Hillary Clinton and Barack Obama unveiled proposals this week to address spiraling foreclosures, and the hottest topic in the televised Republican debate last week was illegal immigration.

Healthcare is the No. 2 issue after the war for Democrats, while illegal immigration comes second for Republicans.

The national telephone poll taken last Friday through Sunday surveyed 425 Republicans and 494 Democrats.