For more on Sen. Joe Manchin of West Virginia, watch CNN’s “Inside Politics with Manu Raju” at 8 a.m. ET and 11 a.m. ET. Washington CNN  —  As Joe Manchin prepares to leave Congress after nearly 15 years, the West Virginia senator — who left the Democratic Party and registered as an independent earlier this year — is further distancing himself from his former party, calling the Democratic brand “toxic.” “The D-brand has been so maligned from the standpoint of, it’s just, it’s toxic,” Manchin