THE BUSINESS CANDIDATES:

Business groups say this could help fuel a more aggressive push into the Iranian market in 2017, especially in the second half of the year, if a Clinton victory is followed by the re-election of moderate Iranian President Hassan Rouhani next May.

"If Clinton and Rouhani win, then we will have a political window of opportunity that is much bigger than we have now," said Matthieu Etourneau, who advises French firms on the Iranian market for MEDEF International, the French employers group.

"This is what the European banks and companies are waiting for," he said.

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