In part one Simon Carswell reports on the victories for Donald Trump and Hillary Clinton in the Super Tuesday primaries that leave the two with considerable - but not insurmountable - leads for the nominations of their respective parties.
In part two Guy Hedgecoe reports from Madrid on the ongoing struggle of the four main parties there to form a government four months after an election - a difficulty that will resonate in Ireland, where an inconclusive election result has just been delivered ...
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