A head to head comparison of the Arkansas 2016 Primary gives us an idea of the break down of the voters.
Hillary Clinton received 144K votes beating both Donald Trump by 11K votes and Bernie Sanders by 80K votes.
Hillary Clinton wins 30 out of the 75 counties in the state of Arkansas. Donald Trump won more counties (34 counties) than Hillary Clinton, but received fewer votes overall. Bernie Sanders won no county.
Bernie Sanders vs Clinton
Hillary Clinton vs Donald Trump
Donald Trump vs Bernie Sanders
In a head to head match up on just the total number of votes, Hillary Clinton (69%) beat Bernie Sanders (31%). Hillary Clinton (52%) beat Donald Trump (48%), and Donald Trump (67%) beat Bernie Sanders (33%).
These 10 counties play an important role in these primary elections. Pulaski contains nearly as many voters as the next top 2 counties. Winning among the top counties is required for gaining enough voters to win the primaries in the state of Arkansas.
Hillary Clinton was able to get 38% of the voters in the top county (Pulaski). She also won a majority and some large minorities of other counties, securing her the victory in the 2016 primaries in the state of Arkansas. Donald Trump won more counties, but not as many votes as Hillary Clinton. Bernie Sanders lagged behind both Donald Trump and Hillary Clinton.
Related References: 2016 Arkansas General Election Story