Demonstrators gathered in major cities in France, the United States and Germany on Saturday to condemn Iran’s crackdown on pro-democracy protesters in Tehran. The rallies ranged from tens of thousands of Iranian exiles and supporters who crammed a Paris, France-area convention center to the hundreds of demonstrators who braved a downpour in Washington to march to the White House. In Hamburg, Germany, protesters marched against the announced result of last week’s Iranian election, which had President Mahmoud Ahmadinejad declared the overwhelming victor in voting that opposition groups called rigged.