> Why? I'd expect just the opposite.
To many Americans, Apple is the example of American innovation and entrepreneurial spirit, and a proof that the American model works. Apple employs 10s of thousands of Americans directly, and probably provides jobs for 100s of thousands indirectly. Going too aggressive on Apple, e.g. at the level where executives could be charged in court, or products embargoed, would be a decidedly unpopular move with many voters and politicians. Samsung is a much easier target here.
Also as an American company, Apple can legitimately enter the democratic debate, see the calls it makes to congress. Samsung can't really do that. Imagine Samgsung putting out press release quoting the founding fathers or referring to the first amendment. That would not be credible.
Edit: grammar