Earlier this year, I noticed that Paul Ryan had a pretty big "communications coaching" expense on one of his disclosure forms. This was right as he produced the videos on his roadmap, the ones where he went from wonk to convincing communicator. Clearly the help was worth the money.
I emailed the coach with a few questions, and he kindly replied with a suggestion to read his book.
I did. Here's my review: people that communicate with others need to do what this book says.