Last week, President Obama announced he is now in favor of gay marriage and said his stance had evolved over the past two years. Here are some of the evolutionary stages of Obama's opinion:

Nov. 30, 2008 : The president is so moved by the film Milk that he decides to watch all of Sean Penn's other movies

: The president is so moved by the film Milk that he decides to watch all of Sean Penn's other movies Oct. 21, 2009 : Sees Dick Cheney on television criticizing the administration's Afghanistan policy, thinks the former vice president might be a little happier if his daughter were married

: Sees Dick Cheney on television criticizing the administration's Afghanistan policy, thinks the former vice president might be a little happier if his daughter were married November 23, 2009 : Stops using the word "gay" to describe Vice President Biden's opinion on foreign affairs

: Stops using the word "gay" to describe Vice President Biden's opinion on foreign affairs Apr. 15, 2010 : Is touched by impassioned letter from Rip Taylor saying that his final goal in life is to throw confetti at his own wedding

: Is touched by impassioned letter from Rip Taylor saying that his final goal in life is to throw confetti at his own wedding Oct. 14, 2010 : After years of resistance, Obama finally starts to get into the Scissor Sisters

: After years of resistance, Obama finally starts to get into the Scissor Sisters Apr. 3, 2011 : Obama struggles with his position, his conscience saying, "Demand equality for gays now," and his poll numbers saying, "Wait for some more old withered bigots to die off first"

: Obama struggles with his position, his conscience saying, "Demand equality for gays now," and his poll numbers saying, "Wait for some more old withered bigots to die off first" Apr. 26, 2012 : 10-year-old daughter Sasha explains to him that gay marriage is uncontroversial for the vast majority of young people and, in 20 years, opposing it will seem to them as inexplicable as supporting segregation

: 10-year-old daughter Sasha explains to him that gay marriage is uncontroversial for the vast majority of young people and, in 20 years, opposing it will seem to them as inexplicable as supporting segregation May 8, 2012: Vice President Joe Biden sticks his head into Oval Office and asks, "What the fuck are you afraid of?"