I've seen discussions on here about Biden winning this year because he works in the ruling class's interest.
If the CIA really did just push a button at Langley and decide the next president, why not Hilary?
She's a corporate ghoul like the rest of them, loves war, everyone expected her to win, and the election was close enough to be plausible either way. She would have been a more reliable, or at least knowable, asset to the deep state than Trump.
She would have been the same mid president as Trump, but it would have been more of a banality of evil approach. Everyone's material conditions would have gotten worse in the same way but there wouldn't have been the media circus around everything she did.
So why do you think the 'most qualified' person for the job didn't win last time? And what could that say about this year?
Trump and any of his supporters weren't seen as being against the interests of the ruling class. You wouldn't see such an intervention unless the opponent was believed to seriously endanger the fabric of class society in the United States, any of its allies or countries with a neutral relationship with the US.
Someone like Corbyn, for example, for supporting a fairly internationalist foreign policy instead of one that would benefit the west's position in politics and business, even though the commitment to socialism is mild at best. Meanwhile Trump was seen as someone willing to use the United States' power to improve its own position at the cost of its allies. It had its opponents, but had the goal to strengthen the status quo in the United States. Biden did the exact same thing, but that was Europe's thing to find out.
However, if countries of Europe were to look toward a different partner in capitalism, or try to become a big imperialist player (too late now, probably) - barring the gates of open trade to US companies, the American Bourgeoise would become openly hostile to Biden or whoever was in power.
After all, the role of the state under capitalism - no matter if authoritarian, no elections, military on the street, etc. or through the ballot box, is to ensure that capital is happy (or be deposed under capital's influence). That is not just one state's objective. It's all's. Be it trying to join forces into something like the EU or do it independently, there is competition and there is conflict over who is the top dog.