Only natural persons should be able to contribute to political candidates.
Corporations can lobby, as a corporate person, just like a union or other organization, but not contribute.
They can run ads themselves, but there needs to be a much greater wall between PACs and candidate campaigns, with the previous restrictions now null and void due to lack of enforcement.
If it's okay for Corporations can run ads themselves, then your objection isn't to wealthy people supporting candidates or even them doing so secretly, but... only when the little guy pools donations and they happen to be pool donations via a corporation?
Candidates should only accept funds from natural persons, that amount should be limited per person.
PACs and other candidate-adjacent activities should require 100% transparency on the source of funds and not be allowed to co-operate/co-ordinate with any candidate's campaigns. Companies can fund PACs, but they should be required to receive shareholder endorsement and not co-ordinate with their employees.
Laws impacting on the 1st amendment require strict limitation on how the government legislates and for an explicit need.
In this case, it is to ensure the integrity of the political process of selecting candidates and electing members of Congress.
The problem isn't "corporations can do the same thing as people."
The problem is anybody (solo or as a group) can legally run an unrestricted indirect campaign.
Elon can do the same, or more, as an individual than just about any corporation. That's just as problematic as Ford or Meta buying an election.
Dark money contributions are a closely related problem that we ought to fix at the same time.