Republicans furthest to the right are also most likely to reject the scientific consensus that human activity is to blame.
Why does this matter for 2016? Because conservative voters turn out heavily in primaries.
In 2012, two-thirds of the Republican primary electorate identified itself as conservative or very conservative in exit polling. Only one-third identified itself as being moderate or liberal Republicans.
When two-thirds of voters overlaps with the group that’s most likely to reject the idea that we should address climate change, that’s a strong disincentive to hold your ground on the subject.

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