WASHINGTON/SAN FRANCISCO (Reuters) – A Chinese state-backed company’s plan to buy U.S. chip maker Micron Technology faces no shortage of obstacles – questions about the price, worries on Capitol Hill, an aggressive regulator – and any one of them could torpedo the deal. Analysts argued Tsinghua Unigroup Ltd’s proposed price, $23 billion, was far too low. “If people decide that if what Micron makes isn’t important any more (it will be approved),” said Jim Lewis of the think tank Center for Strategic and International Studies.