Multiple media outlets are reporting that former Massachusetts governor Mitt Romney has chosen Rep. Paul Ryan (R-WI) to be his running mate on the Republican ticket this fall.

I heard it first from NBC News, then Huffington Post, now just confirmed by the Associated Press. From what I understand, there will be a rally to officially announce the pick tomorrow -- but the cat is out of the bag.

If you're unfamiliar with Rep. Ryan, here's a backgrounder from National Journal:
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