Political pollsters not only "report the news" but they also "make the news" and the trends they "report on."  Let me illustrate with the following actual first hand experience from the current U.S. Senate race.  Here's the account:

Pollster:  "Have you decided who you're voting for?"
Home owner:  "Absolutely!"
Pollster:  "McCain or Glassman?"
Home owner:  "Gilyeat!"
Pollster:  "Who?'
Home owner:  "Ian Gilyeat."
Pollster:  "I'm sorry, that name's not here. You have to pick one or the other. McCain or Glassman."
Home owner:  "Neither. I'm voting for Gilyeat."
Pollster:  "Well, then I'll put you down as Undecided."
Home owner:  "But I have decided. I'm with Gilyeat."
Pollster:  "Well, that's not here! Thank you for your time." CLICK

You draw your own conclusion but here's the latest poll showing "undecided" with 19% of the vote among "likely voters", 25% "undecided" among "registered voters" and may I dare say much higher still among "conservative and Independent voters."

www.electiangilyeat.com