Summary
Donald Trump called for Republicans on Wednesday to rally behind his presidential candidacy after he cruised to primary victories in three more states, declaring that he could not be defeated in the November general election as the standard-bearer of a united party.
Clinton, however, crushed Sanders in the southern state of Mississippi, continuing to win a large margin among black voters.
Trump's lead over Cruz in the race for delegates grew by only 15 delegates.
Among Republicans, Trump has at least 446 delegates and Cruz has at least 347 .
It takes 1,237 delegates to win the party nomination.
After Tuesday's results, Clinton has accumulated 1,221 delegates and Sanders 571, including superdelegates, the party insiders who can support whomever they like.
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