Dead-heat poll results are astonishing – and improbable, these experts say

It's possible the tied race reflects not the sentiments of the voters, but rather risk-averse decision-making by pollsters

The US presidential election campaign enters its final weekend with polls showing Donald Trump and Kamala Harris in seemingly permanent deadlock and few clues as to which of them will prevail on Tuesday.

At the end of another unruly week that began with Trump's racially charged rally in New York's Madison Square Guardian and was punctuated by celebrity endorsements, misogynistic comments and insults about garbage" being levelled left and right, the Guardian's 10-day polling average tracker showed little change from seven days earlier, with voter loyalty to their chosen candidate appearing relatively impervious to campaign events, however seismic.