The long-running US television staple is coming to an end, signalling the slow death of late-night comedy and the worrying cultural power of TrumpThe idea that the political career of Donald Trump would be a goldmine for comedy died a long time ago, with the coffin accepting stray nails for the past five years. The latest and possibly last such nail is the cancellation of The Late Show, the CBS late-night talkshow hosted by Stephen Colbert since the fall of 2015, and originated by David Letterman when the network poached him from NBC in 1993. At this point, Trump hasn’t just made topical late-night comedy look outdated, hackneyed and an insufficient response to his reign of terror; he’s also made a chunk of it flat-out go away.There will be time to eulogize Colbert’s particular talkshow style later; the Late Show isn’t leaving the air for another 10 months, when his contract is up. Surely that leaves plenty more time to savage the president – and Colbert has been in this slot since ...