If you've been out and about in Sydney in the last couple days, you might have noticed a multi-vehicle motorcade making its way through the city.Former US president Barack Obama and first lady Michelle Obama are in town to kick off a speaking tour - and they brought a small army of security with them.Ex-presidents tend to be very public and polarising figures, especially worldwide, and the US isn't keen to see them kidnapped, held hostage, or otherwise harmed.
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