Make the opponents' goal more expensive than it's worth.
Politics is of the heart as well as of the mind. Many people don't care how much you know until they know how much you care.
Moral outrage is the most powerful motivating force in politics.
Promptly report your action to the one who requested it.
One big reason is better than many little reasons.
A prompt, generous letter of thanks can seal a commitment which otherwise might disappear when the going gets rough.