By Julia Wolfe Randy Yeip and Aaron Zitner Illustrations by Paul Antonson Photo: Andrew Burton/Getty ImagesPublished Feb. 1, 2016 at 6:00 a.m. ETNotes: "Believe strongly that the government should take action to reduce income differences" refences to democratic primary voters rating themselves as a 1 or 2 on a scale from 1 to 7, with 1 meaning the government should take action to reduce income differences, and 7 meaning it shouldn't.Sources: Associated Press; General Social Survey; WSJ/NBC News telephone polls; National Election Pool exit polls