If this is true, then the marketing firms are getting paid for nothing. Think about it, what kind of people hangout in coffee shops? Liberals do. Conservatives can usually be found at work, not killing time lounging around a coffee shop.
So in essence, the DNC is paying a marketing firm to "preach to the choir".
That does have its uses. Still and all, I think it's intellectual laziness on the part of most Americans - they still think CBS tells the truth.