Couple of posts before wenlock explained how he collected all the cases filed during Oct. 1 Nov. 30 period from the whole country and he listed these cases. He used PACER, if you are interested only in you district, you should go to that web site, and put Chertoff in the last name box of the party. You should select 890 and 540 for the type of cases. (usually, 1447(b) based lawsuit are under 890, the WOM cases are under 540). Some N-400 applicants filed WOM lawsuits, not Petitions under 1447(b).
When you get a list of cases, you count how many total and how many are still open. This gives you the first indication, what is the upper limit of successful cases. (not necessarily all closed cases were resolved in Plaintiff's favor.) If you want to dig deeper and find out, how many of the closed cases were successful, you will need to go to the dockets of these cases and look at the end for a judge order and see what contains this. I know that it is an expensive and time consuming process, but I don't know any better (easier) way to get the info you need. Reading through these cases will be also a good opportunity to educate yourself about these types of lawsuits.