Possible Clues:

• Political campaign in March, terribly nasty
• Disorderly march cancelled -- is even changing into friendly campaign
• Talisman joins odious campaign of flattery
• Campaign of flattery
• Damage after Conservative goes on disagreeable mission to gain favour
• Repugnant church member's first attempt to win favour
• Slough's allure is, on reflection, very English (that might win you over)
• Thing I like about much of East Anglia I have summarised, bringing flattery to an end?
• Attempt to get one's own way with nasty trinket first
• Constant evil distasteful in sycophantic campaign