Who Is Yulia Tymoshenko, Ukrainian Presidential Candidate Jailed By Viktor Yanukovych?

Former Ukrainian Prime Minister Yulia Tymoshenko was hailed as a hero of the 2004 Orange Revolution before she spent three years in jail for allegedly politically motivated crimes. Now, Tymoshenko is running for president of Ukraine, but who exactly is she? And why is she a controversial choice for many Ukrainians?