Thanks for this. I can't find a list of the market with the most spent, but I can't find another market that has seen more spending than Tampa. $13.9 million in cumulative spending. The closest I can find is the Cleveland, OH market at $12.3 million.
There are a few glitches with the site. It helps to refresh the page after every action you take. At the very top where it says "Cumulative spending" on the left and "Weekly spending" on the right...this allows you to switch between the two views. On the far left, it will give you the cumulative spending for each candidate and Super Pac. If you switch to "weekly spending mode", click on a candidate/PAC, and the total it spent for last week will appear where the cumulative spending total appeared (right above the map on the left). The orange colored bars above the map allow you to select which week you can view, dating all the way back to November of last year. The site takes a bit of investigating to get use to, but once you get it, it's an incredible resource. They can be somewhat slow to update at times. For example, right now, the most up to date week they have information for is July 2-8, 2012. I'll be surprised if it isn't updated very soon.