Campaign ad spending: How much are Romney and Obama spending per electoral vote?

As part of this week's feature "Purple Haze," we take a dive into the millions of dollars used for advertising in Colorado by the presidential campaigns and a handful of very wealthy super PACs. Based on the latest numbers, more than $25 million has been spent in this battleground state as of August 26th.

Here, we dig deeper into why the green in this state, compared to other key swing states, shows us just how purple Colorado is.

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Sam Levin
Contact: Sam Levin