Take a look at this:
Crooks and Liars: “Jane says the word on the street is that Viveca Novak earned the opportunity to testify before Patrick Fitzgerald because she told her very good buddy Robert Luskin in May, 2004 that his client Karl Rove was Matt Cooper’s source, and Luskin is now claiming this conversation jogged Rove’s memory and caused him to go looking for his now-famous email to Stephen Hadley.”
I don’t know what email program Karl Rove is using, but pretty much every major program offers some form of keyword search. It’s amazing how little Rove can find before someone else brings it to Rove’s attention that it exists.
How would that not be obscruction?