As the US presidential election campaign nears its conclusion, and Covid-19 infections surge across the nation, interest has intensified in the handful of “battleground” states which, under the electoral college system, will ultimately decide the election’s result.

In 2016, Donald Trump won in Michigan by 0.3 per cent, his smallest margin nationally. In 2020, the state has been constantly in the headlines as he feuds with its Democratic governor, Gretchen Whitmer, over her relatively tough and…