Answer:
An unlimited amount
Step-by-step explanation:
According to the Political contribution rule, Municipal Finance Professionals cannot make contribution of more than $250 to an elected official's campaign.
However in this case the ex-issuer official lost the general election and is not able to influence municipal securities of the MFP.
So they can contribute any amount to the clean up campaign since the official is out of office.
The Political contribution rule was instituted to prevent office holder from manipulating MFP securities in exchange for large contributions.