I’ll assume that you aren’t lying, but are ignorant of the fact that Deberry is no longer a Democrat. In fact, he was actually kicked out of the party.
“DeBerry (independent) is running for re-election to the Tennessee House of Representatives to represent District 90. He is on the ballot in the general election on November 3, 2020. He was disqualified from the Democratic primary scheduled on August 6, 2020.
On April 8, 2020, the Tennessee Democratic Party voted to remove DeBerry from the August 6 primary ballot.”
John DeBerry Jr - Ballotpedia.
As for why you likely support him;
“To supporters, DeBerry — a 69-year-old Black preacher from Memphis — is a man of high integrity and strong moral convictions based on his Christian faith.
But to opponents, including Planned Parenthood, the LGBTQ Victory Fund and the Tennessee Democratic Party’s executive committee, the 13-term incumbent is an out-of-touch relic. In their view, DeBerry’s conservative positions on issues such as abortion, gay rights and school choice make him unfit to remain in office.”
Ousted by Democrats, anti-abortion preacher runs as independent in Tennessee | The Christian Chronicle