Katie seems to have a big beef with Amazon, yet her data contradicts her argument. If Amazon's market share is dropping, how can they be a monopoly?
That being said, Obama needs to let the market sort itself out, not the government sort it out. Yes, Apple is overcharging. Apple *always* overcharges. That's their business model. People who love Apple products will buy from Apple, even if they are being over charged. People who don't want to be overcharged will go other places (Amazon, B&N, etc.)
The e-book industry is growing like crazy. Just let the market flow and Amazon won't be @ 60% for long just because of the large number of offerings.