(
link)
Yes I know it's 13 months old but as far as I know there isn't a more recent poll.
542 Likely Voters
±4.2% Margin of Error
Conducted July 9-11, 2008
Barrett (R) 31%
Rex (D) 36%
McMaster (R) 36%
Rex (D) 36%
Tanenbaum has since this poll was taken indicated that she will not be running, but I include the numbers below anyway, since they suggest that Barrett wasn't lagging as far behind McMaster as the Rex numbers alone indicate.
Barrett (R) 40%
Tanenbaum (D) 39%
McMaster (R) 39%
Tanenbaum (D) 39%
Breakdowns by gender, party, race, and age available at the
link.