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[eli]

That's not actually really relevant to this particular case, which is a state ballot measure not a national campaign for office.

[jamesteow → eli]

In this case, that's true.

But his/her question was: "but why/how does money affect creation of laws in the US?"

The ruling allowed corporations to fund candidates in any candidate election. These candidates then have a better chance of winning (though certainly not guaranteed) through sources of funding that they hadn't had before. By influencing who gets elected, corporations have a better chance of influencing which bills are created and passed.

[borism → eli]

Very much relevant. That ruling meant among other things that political spending amounts cannot be limited.

[sqs → borism]

It's far more complex than that. Are you talking about political spending by campaigns or by independent groups? By PACs or by corporations/unions? Within 60 days of an election (or 30 days of a primary) or not? Etc.