Tonight, pollster Frank Luntz assembled a focus group consisting of undecided Colorado voters. By the end of tonight’s debate, the group had moved dramatically toward GOP nominee Mitt Romney.

At least half a dozen focus group members who voted for Barack Obama in 2008 now say they will vote for Romney. Virtually everyone in the group said that Romney won the debate and exceeded their expectations.

Luntz, who has been in the polling business for at least two decades, says he has never seen such a dramatic shift in opinion as a result of a debate.

Frank Luntz focus group overwhelmingly sides with Romney, says Obama was "flat, slow" — Brad Schnure (@schnure) October 4, 2012

Frank Luntz says tonight's focus group represents the biggest swing he's EVER seen after a debate. — Bob Owens (@bob_owens) October 4, 2012

@DPJHodges Frank Luntz focus group of 24. 13 voted for Obama but 21 of them say Romney won. Of 24 undecideds 8 decided tonight for Romney — Niall (@NiallMFC91) October 4, 2012

Frank Luntz focus group of 24 people all thought Romney came out on top except for 3 — Wayne Dupree (@WayneDupreeShow) October 4, 2012

In related news, CBS News reported results of a post-debate poll of undecided voters:

CBS News Poll of uncommitted voters shows 46% pick Mitt Romney as debate winner. 22% say it was Pres Obama. 32% call it a tie. — Mark Knoller (@markknoller) October 4, 2012

Poll shows 56% of uncommitted voters say their opinion of Romney has changed for the better. 13% say that about the President. — Mark Knoller (@markknoller) October 4, 2012

Poll shows Romney narrowed gap on empathy. 63% now say Romney cares about their needs and problems (up from 30% before debate.) — Mark Knoller (@markknoller) October 4, 2012