Scott Walker has a Huge Lead

Marquette University Law School is out with a new poll in Wisconsin that finds Governor Scott Walker (R) has built a lead on challenger Mary Burke (D) among likely voters, 50% to 43%.

Marquette University last poll had the race tied. There has been no blunders on either side so it is puzzling to see Walker with this big of a lead over Burke. Could a red wave really be building?