It’s there. Look further down the page. Compares Trump vs Clinton to date, and Romney vs Obama at this time four years ago
Sorry. I saw that after I posted. But again, review that WP link. It includes a cool interactive graph that plots out state by state ad spending from April to November 2012. Romney significantly outspent Obama in almost every state for the duration of the election. And lost almost every state he spent his money in. It also shows that both campaigns significantly ramped up spending in early October. That is because lots of data shows political ads have a very short term impact. No point in spending money if the impact doesn’t carry to the election. Early voting has only just started. If you are going to spend money on ads, now is a better time to do it.