Spending on radio and TV ads is now on pace to reach the $1 billion dollar mark by elecitons day. This week alone, more than $58 million is being spent on ads. So where is all that money being spent? When it comes to battleground buys - it's all about Ohio, Ohio, Ohio. Four of the top 10 hottest markets this week are in the Buckeye State. This is the first time since the week of April 23rd that no Virginia market is in the top 10.