Labor takes out billboards pressuring Pawlenty

Chris Cillizza tweets some on-the-ground evidence that labor is ramping up pressure on Tim Pawlenty to certify Al Franken winner of the Minn. Senate race:
TheFix National Dem group ramps up pressure on Tpaw to certify Franken: http://bit.ly/NZM6T

The link goes to the pic below: a billboard urging Pawlenty to certify Franken and suggesting the Governor's national ambitions are hurting Minnesota. The "Seat Our Senator" coalition--consisting mainly of labor groups--is responsible for the ad.