I don't think it's most because a large number of candidates are on the same page giving the illusion of choice. It's only the occasional race that needs fixed. I recall a local city council proposal where the vote was split for a huge contract worth about $600 million taxpayer dollars. All they needed to do was get 1 member a job offer in another state so they could appoint who would go along with the plan. They picked a lower wage earner member and offered a job with a 3 year contract for a sick amount of money. Hard to refuse a job where you could retire in 3 years. They could pay that person $1 million in 3 years and it wouldn't dent the profits