Republican registration and vote shift (154 instances)
Democratic registration and vote shift (81 instances)
Republican registration shift but Democratic vote shift (8 instances)
Democratic registration shift but Republican vote shift (25 instances)
−15%−10%−5%0%5%10%15%−10%−5%0%5%10%
Dem registrations
Shift in Democratic presidential vote
This chart looks only at how numbers changed; for example, a county may have voted heavily Republican in two elections, but a slightly Democratic shift in registrations tended to then lead to a slight Democratic shift in votes.