I'll be boring and just go with the end of the shutdown, along with the end of the debt limit threat.
Not sure what I have that didn't matter...I suppose I don't really think that the specific votes among mainstream Republicans on ending the shutdown mattered all that much. That is, it mattered a lot that it ended, but it's relatively unlikely that anyone will draw a primary (or a more significant primary) only because of a "yes" vote, or take a hit in the general because of a "no" vote, all else equal. It's possible, but unlikely.
That's what I have, but there was a lot going on. What did you notice? What do you think mattered this week?