Arguing the economics of this thread ignores the more vital issue at hand, which is National Security, not economics.
A robust economy is a placebo if your freedom and way of life is the price you pay for that 'economy.' Those who would trade their freedom for security (or for a good economy) will receive neither.
More pointedly, a 'good' economy where America's manufacturing base disappears is not a 'good' economy for America. Period.
I support trade restrictions in the name of national defense (i.e. the Cuban embargo). This whining about China though is all about a bunch of pathetic, lazy, union workers and their non-union friends, wanting federal job protection at everyone else's expense. I think they and their beloved unions should be crushed.