A Tuesday to remember

First: Americans in more than a dozen states across the country are casting their ballots. Their decisions could effectively end the primaries and all but hand the Republican nomination to Donald Trump for the third straight election. 

Plus: Is this Nikki Haley's last stand? She's on the verge of mathematical elimination. So, what's her next move and where will her supporters land? 

And: Four years ago, Joe Biden pulled off a staggering political comeback. This time, he's an incumbent president preparing for a rematch with monumental consequences. 

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