Best POD to prevent Marcos dictatorship?

What's the best PoD to prevent Ferdinand E. Marcos from declaring Martial Law in 1972 and using that to establish a dictatorship? He has to become President though.
 
Well, have FEM never spent billions of pesos (electioneering) to widen his victory margin against Osmeña, thus preventing the First Quarter Storm and the subsequent unrest thereafter.
 
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