Chants of "USA, USA, USA" erupted as he took the stage in Selma.
Cawthorn opened by criticizing his party leadership for being too moderate and failing to stand up for ordinary Americans.
"We have so many in the national party... who believe that the key to saving our nation is cheapening our platform and going after these non-existent middle ground voters," he announced.
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"My friend, there is no middle ground with Marxists."
"The key to save your nation is not going after these voters that don't exist, but it's going after the disenfranchised men and women in our country, the people that don't even bother to vote because it's been proven to them time and time again that the government will never work on their behalf."
His denouncement comes after he came under fire from his Republican leader in the House of Representatives for wild assertions regarding orgies and cocaine in Washington.
Last month, House Republican leader Kevin McCarthy announced that the 26-year-old had lost his trust after admitting his claims regarding Washington were exaggerated.
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And he announced he may take further action over the remarks, which caused an angry outcry among Hill Republicans.
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Yet Cawthorn was received as a conquering hero in his home state.
He told the story of how he was told he would never stand again after a car crash seven years - and then rose out of his wheelchair to deliver the rest of his address on his feet.
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"We will restore the Second Amendment by repealing the National Firearms Act," he stated.
"We will secure our borders and finally my friends. We will impeach Joe Biden for his dereliction of duty."
The cheers showed he was among friends and being dressed down in Washington.
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The row erupted when Cawthorn, at 26 one of the youngest and most controversial House members, insisted he had seen proof of "sexual perversion" in Washington during an interview with John Lovell for the "Warrior Poet Society."
He was asked whether D.C. resembled the Netflix show House of Cards, and its elements of "corruption, power, money and perversion."
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"The sexual perversion that goes on in Washington ... being kind of a young guy in Washington where the average age is probably 60 or 70, I look at all these people - a lot of them who I've looked up to throughout my life ... then all of a sudden you get invited to like, 'well hey we're going to have kind of a sexual get together at one of our homes. You should come,' like, what did you just ask me to come to?"
"And then you realize they're asking you to come to an orgy," he stated.
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