There is a post which says that Obama is the weakest primary front runner ever, but that is incorrect. In 1976 Jimmy Carter lost 8 of the final 16 primaries and caucuses:
Carter won: West Virginia, Maryland, Michigan (by 1% over Mo Udall), Arkansas, Kentucky, Tennessee, Ohio and South Dakota.
Sen. Frank Church won: Nebraska, Idaho, Oregon and Montana.
Gov. Jerry Brown won: Nevada, California and New Jersey.
Hubert Humphrey as a write-in won: Rhode Island.
Both Church and Brown got in the campaign late and there was some buyer remorse regarding Carter. But he got the nomination and came out of his convention with a 30-point lead (which eventually evaporated), but still won the election.
http://www.geocities.com/Athens/Agora/8088/Dem1976.htmlLike Obama, Jimmy Carter came out of nowhere and captured the Democratic nomination and he went on to be elected president. Obama is up against one of the most powerful machines in Democratic politics--The Clinton machine. Up against the wife of a popular former Dem president and a US Senator from NY in her own right and yet he has dominated the primaries, thus far winning 30 to her 14. I don't think he has been a weak primary contending front runner, considering it was Hillary who was the front runner coming into this.