I never really thought of it like that but I’ll go along and say yes an Iphone user in a majority sense does appear to be mostly of the liberal crowd.
Aside from FoxConn, it also appears that Apple is taking advantage of their low-wage employees at the Apple stores in the United States. The average fulltime Apple Store employee pulls in around a half million per year in revenue for the company but are paid peanuts - not much better than your average Wal-Mart store.
But liberals love Apple and hate Wal-Mart. Probably because Apple makes lots of shiny toys and their co-founder Steve Jobs was such a typical liberal - to wit, a condescending, self-important jerk to most people he dealt with.