My rule of thumb is that when 99% of the politicians agree on some specific matters that only have 40-50% approval among the general population. There is a problems.
Modern democracies are more subtle than USSR and such.
You don’t really need to fraud the election because you can just coordinate press campaign for weeks.
You don’t really need to submit politicians, you just need to mostly pick them from the same type of schools, companies or socio economic background.