The Gallup folks take a trip down polling’s Memory Lane to see how Democratic frontrunners have fared over the last 30 years. In September 1991 undeclared candidate Mario Cuomo led Democratic rivals with 31%, followed by Jesse Jackson, Jerry Brown, Tom Harkin, Douglas Wilder and Bob Kerrey. Eventual nominee Bill Clinton trailed the pack with 3%.

In October 1975 Hubert Humphrey led Democratic candidates with 23%, followed by George Wallace with 19% and “Scoop” Jackson with 11%. Jimmy Carter, still unknown nationally (“Hi, I’m Jimmy Carter and I’m running for President”) tallied 1%.

In Gallup’s latest poll (September 14-16) of likely Democratic voters, Senator Clinton at 47% has a commanding lead over Barack Obama (25%) and John Edwards (11%). So, will she stumble? Possible but not very likely, says Gallup.