If the Demonicrats want to convict former President Trump so that he cannot run for office again, how do they explain Demonicrat Alcee Hastings who was impeached and removed from the federal bench for corruption, and who has been an elected Representative from Florida since 1993?
The Senate chose not to impose the punishment of disqualification on Hastings.
Under Article I, section 3 of the Constitution, upon conviction by the Senate, an impeached federal official is removed from office and the Senate has the option (but is not required) to also prohibit the official from holding any federal office in the future. I cannot recall any prior impeachment where the Senate elected to prohibit an impeached official (I believe that all prior convictions were judges like Hastings) from holding future federal office.