From what i’ve heard, Unions are cutting him loose, Obama told them last week in no uncertain terms that he does not have their back and they are telling him right back now. The floodgates may well have been opened.
I wouldn't count on that. Can't envision any scenario where union workers become Romney voters. Most likely, Obama will do some kind of phoney-baloney "beer summit" with them over the summer and they will kiss and make up. Count on the unions falling back into line by election time. Best we can hope for is that some of the individual union people stay home on Election Day.
On a positive note, we proved last week that we don't need the union vote to elect a Republican in Wisconsin.
Two fly overs and no on the ground support in their greatest time of need...why would he expect any positive support from Wisconsin unions?