Manufacturing is a target because it's easy for people to see concrete results. They can point at something and say, "we made that", and it tends to generate some sense of pride. The same doesn't really apply for service industries or innovation in the service industries: "we produced consumer surplus by lowering transportation costs via automation" doesn't roll off the tongue as well. :) The same problem exists for…
Manufacturing also provides jobs for both high and low skill workers. As such can be seen as more valuable to a community than say, a software company that only hires engineers and a CS center in a different state. Manufacturing was one of the best roads for a low skill worker to earn good money and move up the rung economically - something that only seems to be getting harder as time goes on.
I work as a technician in aerospace and when I started I had zero experience in this type of manufacturing environment. If I hadn't gotten the opportunity to improve upon my skills while on the job I would most likely still be stuck in a much lower paid and less satisfactory low end retail or service job.