When the March elections in Portugal saw the hard-right political party, Chega, quadruple its parliamentary representation from 12 seats to 50, one conclusion appeared overwhelmingly obvious. Overnight, it looked as if Europe’s most westerly country had become the continent’s latest front line between populist, ultra-conservative parties enjoying surging support and more traditional, centrist formations facing crumbling voter backing. The Chega electoral earthquake – and the narrowest of victories...