This is a 2020 Lindsey Graham ad. Graham won by running against Sanders, instead of against his actual opponent. He portrayed Sanders as a radical leftist, and as the face of the Democratic Party (though he's not even a Democrat).
Sanders loves this publicity. It helps both him and the GOP. E.g. Sanders and Graham did this joint publicity appearance together on Fox News: https://rollcall.com/2022/06/10/graham-sanders-debate-fun/
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