Hillary Clinton has further widened her lead over Illinois Senator Barack Obama in her attempt to secure the Democratic Party's nomination for the 2008 presidential race.
The USA Today/Gallup poll shows the New York Senator at 48%, up 8% from a similar poll three weeks ago, and Mr Obama at 26%, down two points. Third is former North Carolina senator John Edwards, with 12%.
The survey was carried out after an exchange between Hillary Clinton and Barack Obama over foreign policy.
A smaller sub-sample of the poll, asking who would do a better job in certain foreign policy realms, showed a strong lead across the board for Ms Clinton.
60% surveyed said she would do a better job handling international terrorism and 56% said she would be better in the role of commander-in-chief of the military than Mr Obama.
In questions about the war in Iraq and relations with countries unfriendly to the United States, Hillary Clinton came out with a 20-27 point lead over Mr Obama.
Among Republicans, the poll showed former New York mayor Rudy Giuliani ahead, as he has been for months, at 33%.
Second is a man who has not formally declared his intention to run, TV actor and former Tennessee senator Fred Thompson, with 21%, followed by Arizona Senator John McCain with 16% and former Massachusetts governor Mitt Romney with 8%.
