Indiana, Missouri, North Carolina, and Arizona are the only ones Biden can gain unless he crushes Trump by twenty points. Arkansas, Georgia, and such aren't flexible enough to be flipped.
Georgia has a good chance of being flipped. Obama lost Georgia to Romney by an 8 percent margin.
Given that the Hispanic population and turnout will likely be larger in 2016, Biden's support comes disproportionately from racial minorities, and Trump's favorability with Hispanics is roughly 75% negative, I could see Georgia tipping in favor of Biden over Trump.
