Jill Stein is an American politician and physician. She was the 2012 presidential nominee for the Green Party. Stein strongly believes in environmentalism, especially including using alternative energy instead of fossil fuels.
In 2002 Stein ran against Mitt Romney for the Office of the Governor of Massachusetts, but she lost. In 2012 she ran as the Green Party's candidate for president. Her running mate was Cheri Honkala. Jill Stein was arrested in October 2012 for attempting to bring supplies (and Halloween candy) to people protesting the Keystone XL pipeline.