Matt Yglesias notes a tension in lefty thought today: the stuff we all support (better healthcare, more teachers, childcare, new infrastructure, etc.) is in the non-manufacturing sector, and yet we all cheer when President Obama calls for increased focus on manufacturing. So which do we want? More people working in manufacturing or more people working in service and construction industries? It's hard to have both, after all.
For the time being, let's put aside the question of whether we should take Obama seriously on this subject (I suspect not) and whether lefties are really all that committed to manufacturing in the first place (ditto). Instead, I'll repeat a point that I think Matt probably agrees with: the real issue isn't manufacturing per se, it's the tradable sector. That is, we really do have a long-term trade deficit problem, and weakening the dollar is unlikely to fix this all on its own. We also need to make stuff that other people want to buy from us, regardless of whether it comes from someone with a manufacturing NAICS code. So whether we like it or not, we really do need to have more workers in the tradable sector. In practice, this probably means more people working in manufacturing, since that accounts for a big chunk of the tradable sector, but maybe not.1
Either way, though, we can't import oil from Saudi Arabia and MacBooks from China forever unless we figure out something to sell back to them. We can't all be MRI techs, home nursing companions, and K-12 teachers.
1And just to get everyone riled up, I'll point out that the content industry (movies, TV shows, books, music, etc.) is one of the most important non-manufacturing components of the tradable sector. It's why every administration ever, both Democratic and Republican, has supported strong international IP protection. This, perhaps, suggests an even bigger tension in lefty thought than whether we really love manufacturing.