That's near last year's record high of 5.3 million.
There are nearly 1.8 million Democrats and more than 1 million Republicans. The Republican number is up by 21 percent from the last gubernatorial primary four years ago. Democratic registrations are 55 percent higher.
The number of independents has shrunk.
Unaffiliated voters can participate in the primaries by declaring a party any time before they vote. But it's too late for those already in a party to switch.
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