Analysis: Bitter battle between Trump and Biden redefines the midterms

It is extraordinary for a defeated ex-president to play a starring role in the first midterm election since he lost power. Yet Donald Trump’s decision to use the 2022 elections as a stage to avenge his 2020 defeat and President Joe Biden’s strategy of making the man he vanquished the focus of the Democratic campaign are shaking up conventional wisdom about November’s critical vote.