Holder admits earlier perjury before Congress
Perjury tends to be a misused word.
Did Holder willfully tell a falsehood about a material matter?
Willful - check.
Falsehood - check.
Material - maybe or maybe not.
If it can be proven that Holder knew about Fast and Furious from its inception, then testifying that he had known about it for "a couple of weeks" rather than "a couple of years" would probably be material. The difference between "a couple of weeks" and "a couple of months" would probably not be material in the context of when significant events occurred.