OK. I fell on Halloween while mopping my floors. Found out a week later that I had ruptured two discs (one middle back, the second, L5, had the most damage). I had 10 days of excruciating pain managed via pain killers and anti-inflammatories but no surgery. I had one PT session in January of last year and was told to work on my core and stretch. I waited until February of this year to ease back into running (walk/run). I'm up to 3 miles without breaks and no pain during or after running.

Am I stupid to think about training for a marathon in late November? I've run 4 so far over the course of 3 years and was training for two more last year before the fall. I'm not cross training but I am working my core as well as my upper body. I have no pain and can only tell I've had an injury when I move a certain way or lift with my back instead of my knees. My doctor told me the running didn't cause the ruptures but said running won't help them any. I figure 8 months is enough time to get back into running shape and begin adding on the mileage necessary for a 26 mile race or two during the season.

So, am I stupid or just crazy?

You can not marathon train and still be stupid... I suggest taking it slow from where you are through the summer, building just a little bit each week (5%) in duration of your runs (capping off at some point on easy days), staying easy and aerobic, and see where you are come August. Take recovery when you need it, don't push through. Just let your body get there in its time. Good luck! 

+1 with everyone else. Peak marathon season can easily last until late Feb - early March in the southern USA.