Are PACs affiliated with a particular political party?

I’m writing an essay for AP Gov. and was wondering if I understood it right. Here’s a clip from my paper, does it make sense?

“Interest groups contribute money to Political Action Committees (PACs). PACs directly support a candidate, and if the candidate falls in line with the particular interest group, that group will contribute money to the PAC thus essentially donating money to the candidate‚Äôs corresponding political party.”

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