The differences between the states that accepted and rejected the medicaid expansion are so stark.
Maps and statistics like these are why people who attack Obama from the left are jokes. No president has done as much to redistribute wealth and improve the economic standing of working class Americans since LBJ.
Medicaid remains a poor person's program, even in states with the expansion. Working class people get the exchange, which with the subsidies is still a pretty good deal, but most of them (and this would be true of most middle class people too, except they receive coverage through their employer) are far too unsophisticated to understand the exchange and health insurance, and so remain tepid about the ACA.