Well .... taking it with a grain of salt - but it is encouraging. Group was waaaaaaaaaaaaayyyyyyyyy too white - which takes away from the impact they could have had. Perhaps it was because Luntz could not find any black voters that were really 'undecided' - the black community is split hard - and decisively. Those that were/are inclined to vote against obama have already firmly made up their minds on that. Then you have the much larger die-hard segment of the black community where nothing said or done by obama could shake their total belief in the pos.
http://www.realclearpolitics.com/video/2012/10/16/luntz_focus_group_of_mostly_former_obama_voters_switch_to_romney.html

Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good ...