For your reading pleasure, going into detail about how only one senator switched parties, with all the rest remaining in the Democratic Party. And about how the republicans went from 8 seats to 20 in the House of Representatives from southern states. That means well over 100 remained in the democratic party. So… no, voters did not switch to the Republican Party then, and politicians did not switch parties.

https://newstalk1130.iheart.com/featured/common-sense-central/content/2018-05-01-the-myth-of-the-republican-democrat-switch/