As Joe Biden showed, candidates over 80 carry huge risks
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The left-wing stalwart has emerged as the favourite; the right is in disarray
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Voters are disillusioned with the apparent choice between Lula and the son of a jailed former president
Local politicians are too often corrupt and criminal
When governments are indebted, high interest rates wreak havoc
It is a test case for how countries recover from a populist fever
