Members of the fundamentalist Catholic group Civitas demonstrate in Paris, Sunday, Jan. 13, 2013. Many thousands of protesters are mobilizing against the French president's plan to legalize gay marriage, streaming into Paris by bus, car and specially reserved high-speed train. Police are expecting about 300,000 people to march towards the Eiffel Tower from three different points in the city, tying up traffic and closing subway stations for hours in what could be the largest demonstration in a decade.