If Wisconsin Gov. Scott Walker loses the election to recall him from office Tuesday, the political press will declare the arrival of Big Labor's comeback. If Walker wins, it will be seen as yet another sign of labor's demise. The election to recall the Republican governor, sparked by Walker's successful 2011 effort to end collective bargaining for public employees, has drawn participation from many different groups, including the tea party. But unions, which have long been fighting stories of their demise, have much of what's left of their reputation as powerful political organizers riding on the race. Union membership in 2011 fell to a record low for the second straight year, according to the Department of Labor, but that's not the only avenue in which unions have been struggling. Bill Schneider, a a senior fellow and resident scholar at centrist think tank Third Way, told Yahoo News that labor has lately experienced "tougher times winning" electoral race...