I will look at Mitt Romney here. He seems to have a very good management style but to be fairly poor at communicating.
Romney's management skills can be seen in the excellent organization of his campaign. Unlike some of his opponents, he has run a very disciplined campaign. He has been able to create organizations in every state and has not, like Santorum and Gingrich, done things like being unable to get on the ballot in a particular state.
However, Romney seems to have a hard time communicating with people. He seems awkward and unsure about how to connect with people who are suspicious of him because of his wealth. He keeps saying really awkward things that remind people that he is wealthy when that is one of the two things that is most likely to cause him problems with attracting support. He talks about his wife's Cadillacs and about how he likes to fire people. None of this is terrible stuff, it's just really bad when one of the things you need to do is to convince people that you can understand their issues even though you're fabulously wealthy.
Romney, then, is a very focused and organized manager, but he tends to have problems communicating because his style is not natural and comfortable.