That's too black and white. You leave no room for the fact that his memory might be at fault -- it has been 2 years, you know.
Lying to a jury is different from having muddled memories. Lying must include intent. If he was lying, he must be held accountable. There is no room for wiggle in the case of perjury regardless of whose ox gets gored politically.
Perjury is a vile act that undermines all justice.