I tried to start a company in my early twenties where I put the new LCDs into a wood case--I called it Teak Computers. At the time a few LCD manufacturers in California had got the government to place tariffs on the screens. So if I wanted a screen, it was $2,000. Of course, the big manufacturers like Dell could get around that and use Asian LCD in their laptops, etc.
A few years later, no more American LCD makers. All the tariffs did was put small companies like mine out of business (not that I was going anywhere). It's the same here. American startups who could use Chinese parts; they're the ones who are getting hurt.
Of course, this is all for votes. GM has 100,000 in the US and small companies have few.