Who is Joe Manchin, the Senator in the centre of the tight Democratic legislative majority?

Following Joe Biden’s inauguration, the Democrats will have control of the White House, the Senate and the House of Representatives, but the extremely delicate majority in the Senate means even one single Democratic senator could potentially count if sides decide to follow party lines. The tight margin has thrown one particular Senator in the spotlight: West Virginia’s Joe Manchin, known as the most conservative Democrat in the Upper chamber.