May 5 (Bloomberg) -- Senator Hillary Clinton has a seven percentage point lead over Senator Barack Obama among Democrats nationwide the night before the Indiana and North Carolina primaries, according to the latest Ipsos poll.

Forty-seven percent of Democratic supporters across the U.S. would choose Clinton, who represents New York, if a primary or caucus were held in their states today, according to the telephone poll taken April 30 through May 4. Forty percent said they would vote for Obama, of Illinois, Ipsos said in a statement distributed today by PRNewswire.

A previous poll by Ipsos, conducted April 23 though April 27, showed Obama winning 46 percent to Clinton's 43 percent. Both presidential candidates have an edge against John McCain, the presumptive Republican candidate, the poll showed.

Ispos surveyed 1,000 adults. The margin of error was plus or minus 3.1 percentage points.

Paris-based Ipsos is a market research company and has a public affairs unit in Washington.

To contact the reporter on this story: Joseph Galante in San Francisco at jgalante3@bloomberg.net.

Last Updated: May 5, 2008 22:35 EDT