WonkTalk: Happy birthday, Obamacare!

The Affordable Care Act turned three over the weekend. Unlike most other 3-year-olds, who face the challenges of learning colors and the alphabet, President Obama's health law is up against obstacles much more daunting. What we lack in birthday cake, Ezra Klein and I make up for in health policy discussion.

Related: From expanding Medicaid to building exchanges, Obamacare's five biggest challenges.

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