DAVID, WHO runs a well-trafficked shoe-shine stand at a huge convention centre just outside Washington, was in a good mood as he surveyed the delegates at a recent event there. They were attending the ARPA-E summit, an annual pow-wow put on by the Department of Energy (DoE), and were tipping well. A few weeks earlier, when Donald Trump spoke at that same venue at a gathering of conservative Republicans, David was forced to shut down his stand and lost business. It is not his only grumble about Mr Trump: “When he ran for office he promised to drain the swamp, but he turned out to
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