Whenever I see headlines saying that the race is someone's "race to lose at this point", I think of all the frontrunners in many of the elections with 20+% leads in national polls even weeks before the first votes are counted. They didn't last.
Here's one flashback:
JUMPING OFF THE BANDWAGON
James Joyner | Friday, January 16, 2004
The media herd effect is a wonderful sight to behold. For weeks now, virtually everyone with a column or a regular television talking head gig has treated the nomination of Howard Dean as the Democrat’s presidential nominee as a foregone conclusion. Now, with just one poll–with a large margin of error–in a state with a caucus rather than a primary, everyone is now sounding his death knell.
Much more analysis at that time:
http://www.outsidethebeltway.com/archives/2004/01/jumping_off_the_bandwagon/Even George Will was predicting Dean's apparent and inevitable victory:
http://findarticles.com/p/articles/mi_qn4155/is_20031113/ai_n12523166