Harold Meyerson (hat tip, Bryan):

The bipartisan public policy that should raise the most suspicion is trade policy, which fostered the offshoring of more than 2 million manufacturing jobs after Congress normalized trade relations with China in 2000. But an even more fundamental factor in the declining share of working Americans is the technological automation that has eliminated millions of jobs and is poised to eliminate millions more.

The mechanization of work has already taken a toll in the nation’s ports (where cranes have reduced the longshore workforce to roughly 10 percent of its size 60 years ago), factories (where machines and computers have substituted for millions of workers), construction sites (where the prefabrication of parts has reduced the number of construction workers ) and offices (whatever became of secretaries?). And with increasing computing capacity steadily expanding the abilities of machines, we ain’t seen nothing yet.
No shit, Sherlock.