I was just thinking that. If you recall all those candid shots of Hatch murmuring to Leahy with his hand over the mike, complaining about how unfair Leahy was being, and Leahy just blowing him off, you can tell that Hatch is finally able to release all those pent up frustrations.
The potty-mouth even said "Bullcorn!"
-PJ
And then he apologized several times for his behavior. What a gentleman and a scholar Hatch is!