Will Donald Trump win reelection in 2020? To find out, you’d think you could just look up whether more Americans are registered as Republicans than Democrats.
But the truth is, it doesn’t really matter which party you register with on paper. Besides, 19 states don’t even register voters by party.
What really matters is what political scientists like myself call your “political identity” – your psychological attachment to a political group, such as a party or an ideological movement.
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