The 3 independent Pillars of Democracy are the Press Pillar, the Judicial Pillar and the Political Pillar.
They’re supposed to watch over each other because there is a pragmatic expectation even in Democracy that some amongst those holding power will be crooked or become crooker (after all “power corrupts”), hence the 3 independent pillars to solve the whole “who watches the watchers” problem.
(If you look at even the supposedly most well intentioned implementations of ideologies other than Democracy, you see all of them failing because power becomes concentrated in a single nexus, then naturally corrupted and then the crooks just entrench themselves and make sure they’re immune to the Law and will never lose Power)
If you have lots of money and want to subvert the mechanics of how citizens have some control over the highest powers of the land in a Democracy, the easiest way by far is to buy the Press. Once the Press is bought, the politicians can be bought all the while electors are blissfully unware of it because the Press won’t report it. If the Judicial Pillar is not independent of the Political Pillar (for example, because judges are positions of political nomination and/or politicians control the purse strings of the Judiciary Pillar), then you end up with a system were Democracy is but theatre.
The Power Of Citizens having been neutred through these mechanics, the highest power of the land becomes the Power Of Money.
Welcome the the US of A!
(Far from the only one, I might add, but probably the most further ahead in terms of the Power Of Citizens having been nullified)