Did that bad choice in a campaign manager make Ronald Reagan a bad leader? (by your logic).
Reagan had the sense to fire him.
Bachmann’s poor advisors don’t get fired — they quit.
But, yeah, whether Reagan or Bachmann, it shows poor judgment in the individual case. Whether individual cases of poor judgment aggregate to an overall indictment of poor judgment is seen in hindsight. Reagan passed — his good judgment outweighed his bad. Will Bachmann? I see her cases of poor judgment piling up against a rather thin base of experience.
I’ll tell you this: if she abandons her conservatism to join Romney in attacking Perry over Socialist Security, she’s dead to me. That’s one big case of REALLY poor judgment.