Depends on how you run. Compare the physiques of sprinters to that of long distance runners. That is what you get from aerobic workouts vs. high intensity training. If you want bulk, you want high intensity weight lifting.
running can definitely help you gain muscle. I run cross country and track. cross country definitely helps with working out. a lot better than weight lifting I find. I run for about 12 miles everyday so you'll definitely have to work! if you run cross country the course is only 3.1 miles.
How much bulk are you talking about? I find that running burns a lot of calories, and you need calories to bulk up. Try weight lifting, consume protein drinks and eat well. Incorporate running to reduce bulk if you get too heavy. Runners are never very bulky. Too much bulk has a bad effect on a persons back, legs, knees, ankles and feet, especially when a person runs.