I'd further say that emotional intelligence and charisma correlate somewhat with intelligence. They may be developed later, but it's easier for an intelligent person to develop those things.
One college summer I was interning at a sales office, and the sales manager said something that stuck with me: "Often we're selling this product to people who don't really understand it, or don't really understand how it's going to help them. And it's easy to have a deal fall through because of that, and I've seen a lot of salespeople in that situation throw up their hands and say 'bah! The client is stupid, that's why I couldn't sell the thing to him.' But if you're so much smarter, and the client is dumber, then you ought to be able to figure out a way to help the client along and understand the value. Working with a dumb client is no excuse, it's a call to action."