LOL, this is actually pretty good for Walker. Remember that this is a PPP poll without their LV screen (Which was about 11 points more Republican than their RV screen), and their last one before the 2010 election was a tie.
In other words, this means Walker's actually gained relative ground since getting elected in PPP polls, as he's gone from a tie to a 7 point deficit in an electorate that's 11 points more Democrat.
Their last poll before the election had a 53-44 Walker lead with a 34-30 Republican sample.
This poll has a 52-45 Barrett lead with a 33-32 Democratic sample.
Walker lost more ground overall than what the change in the samples might suggest.
The most interesting finding though is that Walker led Independents in the pre-election poll by 54-40, but now he's losing them 44-49.