Beware of reading too much into presidential polls. Take, for example, the 2004 race.
An August 2003 CNN/USA Today/Gallup national survey found Connecticut Sen. Joe Lieberman, the 2000 Democratic nominee for vice president, leading the party’s presidential field with 23 percent. He was trailed by former House Majority (and Minority) Leader Richard A. Gephardt (13 percent), former Vermont Gov. Howard Dean (12 percent) and Massachusetts Sen. John Kerry (10 percent).
A month later, another CNN/USA Today/Gallup poll found the newest entry into the race, retired Gen. Wesley Clark, topping the pack with 22 percent, while Dean (13 percent), Kerry (11 percent), Gephardt (11 percent) and Lieberman (10 percent) were bunched together.
There were others in the race, of course — North Carolina Sen. John Edwards, former Illinois Sen. Carol Moseley-Braun, Florida Sen. Bob Graham, Ohio Rep. Dennis J. Kucinich and activist Al Sharpton — but they barely registered in the polls.
By December, Dean had pulled ahead in the CNN/USA Today/Gallup poll, opening up a considerable lead over Lieberman, 31 percent to 13 percent. Clark and Kerry drew 10 percent, and Gephardt received 8 percent.
(Multiple other polls, including those for CBS News, Newsweek, ABC News/Washington Post and NBC News/Wall Street Journal showed the same movement to Dean.)
A little more than a month later, on Jan. 19, Kerry won the Iowa caucuses with 38 percent, while Edwards surged into second place with 32 percent.…