US voters head to polls after midterm campaign costing more than $16bn

Tens of millions of Americans are flocking to the polls on Tuesday to vote in midterm elections that will determine control of Congress and potentially reshape Joe Biden’s presidency after nearly two years in office.

According to the final polling averages, Republicans are expected to win enough seats in the House of Representatives to regain control of the lower chamber of Congress — which they will use to stymie Biden’s agenda…