From the Quinnipiac University Polling Institute:

• In general election matchups, former New York City Mayor Rudolph Giuliani, a Republican, still tops all Democrats: 46 - 42 percent over Sen. Hillary Clinton; 46 - 39 percent over Sen. Barack Obama; and 48 - 39 percent over Sen. John Edwards. Giuliani led Clinton 51 - 40 percent March 7.
• Giuliani leads the Republican field with 33 percent, with 18 percent for Arizona Sen. John McCain, 7 percent for former House Speaker Newt Gingrich, 6 percent for actor Fred Thompson and 5 percent for former Massachusetts Gov. Mitt Romney.
• Clinton has widened her lead over Obama among Pennsylvania Democrats and narrowed the gap with Giuliani in the 2008 presidential race. Clinton gets 36 percent of Democratic primary voters, with 17 percent for Obama, 13 percent for former Vice President Al Gore, 9 percent forEdwards and 4 percent for Delaware Sen. Joseph Biden. This compares to a 29 - 1 8 percent Clinton lead over Obama in a March 7 Quinnipiac poll.

The rest of the poll is here.