I included the professors I'd like to work with. I even mentioned a recent research article of theirs and why we were a good fit... I listed coursework as well...
I do agree with Sigaba a bit - but I would instead advise that you contact the people you would like to work with and specifically ask them if they will be on campus the year you enter and are open to working with students. If you know the focus of your research you can even mention it as well.
It is advised to contact professors to each school you apply too... the fit is probably more important than GPA, just to give you a sense of how important it is for social science programs... so leaving out who you want to work with would be the equivalent of not mentioning your GPA....
People are not going to try and figure out who would match well with your research, you have to lay it all out there for them... remember, people are lazy and aren't going to look into things for your sake, so you have to take the initiative yourself
Each year I see people that are awesome on paper but get into the awesome candidate but rejected due to lack of fit