Okay kiddo, you know how when you want to buy a toy, you have to use money to pay for it? Well, imagine if instead of buying a toy, someone wanted to spend a lot of money to help a special person get elected.
Now, there are rules about how much money people can give to help someone get elected, because we want everyone to have a fair chance. But some people wanted to give more money, and they said it was because they wanted to have more say in who gets elected.
But other people were worried that if too much money was allowed, then only a few rich people would be able to control who gets elected, instead of it being fair for everyone.
So they had a big court case about it, called Citizens United v. Federal Election Commission. The court decided that it was okay for people and groups to spend a lot of money to help someone get elected, even if it makes it harder for other people to have their voices heard.
Some people think this decision was really bad for democracy, because it means that a few people with a lot of money can have more power than regular people in elections. But other people think it's a good thing, because they say it means everyone can spend their money how they want to.