Should marketing be included as part of the sales organization within a company?

Marketing should work closely with sales but not be necessarily in the same department. It will be important for sales data to be presented to the marketing team and that underlying conditions of that data be understood so obviously some joint effort will be necessary. The marketing team will want to probably oversee brand integration and unifying product message to be consistent with their marketing message within the sales organization. Marketing brings the potential customer to the sales department so there will be justification for constant interaction but the marketing team will need their own room to breath and create.