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Five presidential candidates are in their 70's. If one of Trump wins, he will be the oldest second-term president. Any of the others would be the oldest first-term candidate.
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Donald Trump is stretching his lead in the race for convention delegates by winning the Arizona primary.
The Latest on Republican presidential candidate Donald Trump's campaign trip to Arizona (all times local):
More than 15 million people watched Tuesday night’s Democratic presidential debate in Las Vegas. Vice President Joe Biden was notably absent from the debate, still mulling a possible run.