Joe Biden has won in Tennessee, as his campaign swept through the American South and eastern states on Super Tuesday.

Mr Biden also won in several other states including North Carolina, Alabama and Virginia, which all were projected early on Super Tuesday and showed strength for the campaign, which was written off as dead just days ago before his decisive win in the South Carolina primary on Saturday.

The results — alongside expected wins for Bernie Sanders in western states that finished voting later on Tuesday — appeared to bolster the claim that the 2020 race is evolving into a two-candidate race, with those two men in the lead.

But, Elizabeth Warren and Michael Bloomberg have remained viable in many of the states to vote on Super Tuesday, which could complicate the path to the nomination for both Mr Sanders and Mr Biden.

Mr Biden's big wins on Tuesday followed after two of the best days for his candidacy following that South Carolina win.

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On Sunday, a chief moderate rival, Pete Buttigieg, suspended his campaign for the presidency. And, on Monday, another moderate rival, Amy Klobuchar, also dropped out.