Democratic presidential hopeful Hillary Clinton has double-digit leads over Barack Obama in Ohio and Pennsylvania, both crucial states in upcoming primaries, according to Quinnipiac University poll released on Thursday.
Clinton, a New York senator, has lost eight straight nominating contests to Illinois Sen. Obama, but leads him 55 percent to 34 per cent among likely Democratic primary voters in Ohio, the poll found.
Among Ohio Democrats, women back Clinton, 56 per cent to 30 per cent for Obama, while men back Clinton 52 per cent to 42 per cent, the poll found.
White Democrats favor Clinton 64 per cent to 28 per cent, while Obama leads 64 to 17 per cent among black voters, according to the survey.
"Ohio is as good a demographic fit for Sen. Clinton as she will find," Peter Brown, an Quinnipiac University Polling Institute official, said in a statement.
"It has blue-collar America with a smaller percentage of both Democrats with college educations and African-American than in many other states where Sen. Obama has carried the day."
Ohio, Rhode Island, Texas and Vermont hold nominating contests on March 4. Pennsylvania voters will select presidential nominees in a primary election on April 22.
The survey found that among likely Democratic primary voters in Pennsylvania, Clinton leads Obama 52 per cent to 36 per cent.
In a general election matchup with Republican front-runner John McCain, Ohio voters give the Arizona senator 44 per cent support to 43 per cent for Clinton and 40 per cent for Obama.
In Pennsylvania, Clinton leads McCain 46 per cent to 40 per cent in the general election, Obama has 42 per cent to McCain's 41 percent, the poll said.