A lot of republicans left the party. Anyone still identifying as republican is either a politiican, their family member, or a Trump supporter.
That is a myth. There are more registered Republicans now than when Trump was elected.
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Party Affiliation
In politics, as of today, do you consider yourself a Republican, a Democrat, or an Independent? (Asked of independents: As of today, do you lean more to the Democratic Party or the Republican Party?)news.gallup.com
He also won more votes this time around. They aren't polling all the same people. The voter rolls have increased for all parties as there are a bunch of new voters. Anyone worth a damn doesn't want the GOP stick on them and either moved Dem or Independent.