Corporations and unions can spend unlimited sums on campaign advertising due to Supreme Court rulings treating campaign spending as free speech.
The reason corporations and unions have been able to spend unlimited sums of money on campaign advertising since 2010 is primarily due to the Supreme Court rulings in cases like Citizens United v. Federal Election Commission.
These rulings deemed campaign spending as a form of free speech protected by the First Amendment, allowing corporations and unions the right to make unlimited contributions to influence elections.
Additionally, the McCutcheon decision further extended spending allowances by striking down aggregate contribution limits, leading to a significant increase in campaign funding from these entities.
https://brainly.com/question/27978239