The United States government has changed since the the day its Constitution was first written.
The most obvious change to how politicians are elected in the United States is, of course, is how Senators are selected. Originally, they were NOT supposed to be directly elected by the public.
There are those times (like the 2016 election) when both the Republican AND the Democratic candidate were found completely repulsive by the majority of registered voters. If that happened in a Ranked Choice election, they might lose to a third party. Politics is a funny game, you really can’t predict what will happen.
Since you can’t predict it, there really is no way to buy an election. That means …whoever wins, the odds are pretty good that you voted for them.
Here’s how it works : If the votes cast for the first preferences don’t make it, then the winner of the first round goes on to the second round to see how things turned out. Maybe they will pick up more votes. Maybe not. If there is still nobody with 51%, the winner from the first two rounds go on to the third round. Sure, the first round winner may have picked up a few more votes…but they have a new opponent now, who might be a third party candidate.