Okay, I'll take the obvious one: Veepstakes matters because if Mitt Romney wins then Paul Ryan and not someone else will play a role in his administration, and because it's now far more likely that Ryan will someday be the GOP nominee for president, and therefore possibly president. That's all big stuff, even in the age of the partisan presidency.
What didn't matter is the stuff I wrote about earlier; this doesn't make the election "about" Ryan's budget.
But enough about that already, at least in this thread: what else? What do you think mattered this week?