Why, I'd be happy to provide you with that particular grammar rule! Feel free to skip the dry stuff at the top and skip down to the quick and dirty tip. Once I learned that tip, I never had to think through that grammar rule again.
Allow me to address one more error; my initial correction was directed at Mark Whittington, the author of the piece. (I believe a journalist should know the tools of his craft.) Where you got the idea that I was correcting the grammar of people on this thread is a mystery to me.
Thanks for the tip. That finally answers my question on when to use “who”/”whom” correctly.
I thought you were correcting a FReeper, not Whittington.
Again, feel free to give us a good grammar correction when needed. The website link you provided has some great info on it.