With signs including the slogan: "I need a Mom and a Dad," and pink and blue balloons, 1.8 million French marched on March 24 (second march this year) on the L'Arch de Triomphe to protect marriage between one man and one woman. Crowds (including elderly and children) were tear-gassed by police. Crowds are demanding a referendum.
Gay activists and celebrities are marching also (they are for gay lifestyle, but agree it's not marriage).
Socialist President Hollande is determined to push through the law without the approval of the people.
Even the "Mariannes" showed up at the March 24 march (young women who dress up in white and red like the mother/symbol of the French Revolution). You can get a brief glimpse of them at :58 and 1:58.
Here's more info: http://www.lifesitenews.com/news/1.4-million-march-against-gay-marriage-in-france-police-tear-gas-crowd-chil
See this blogpost from the first march: "WHAT DO THE FRENCH KNOW THAT WE DON'T?"
Oooops! Wrong march (below)...um...but it kinda fits...