The state of California's progressive stance on issues from climate change to immigration has long epitomised liberal opposition to President Donald Trump. He in turn portrays those values as a betrayal of the US heartland and his supporters in the Republican Party So what does this bitter ideological battle reveal about the choices facing Americans in the coming presidential election? Earlier this year, for a special two-part report, People & Power's Bob Abeshouse went to find out. - Subscribe to our channel: http://aje.io/AJSubscribe - Follow us on Twitter: https://twitter.com/AJEnglish - Find us on Facebook: https://www.facebook.com/aljazeera - Check our website: https://www.aljazeera.com/