Hints and tips:
...Biden and Trump could win enough delegates to officially become the presumptive nominee of their respective parties after today’s primaries....
...That’s worth bearing in mind as the candidates head to the Arizona primary and Utah caucus on Tuesday next week....
...Arizona is the more important primary from a technical point of view....
...In February, at a time when Mr Santorum emerged as Mr Romney’s chief rival ahead of Newt Gingrich, Restore Our Future trained its guns on the former Pennsylvania senator in campaigns in Michigan, Arizona...
...But Mr Romney easily won Arizona, winning 47 per cent support, while Mr Santorum came second with only 27 per cent....
...Either way, all the states except Virginia – where Mr Santorum is not on the ballot anyway – award delegates proportionally, meaning that all candidates will accrue some delegates....
...But some – such as Florida and Arizona – have flouted the rules and stuck to a winner-takes-all system....
...Mr Romney is well ahead in the second primary to be held in Arizona. A win there would give him 29 delegates in a winner-take-all state....
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