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When the sun rises over the Rio Grande Valley, the cries of the urracas — blackbirds — perched on the tops of palm trees swell to a noisy, unavoidable cacophony. That is also the strategy, it could be said, that local officials, health care providers and frustrated valley residents are trying to use to persuade Gov. Rick Perry and state Republican lawmakers to set aside their opposition and expand Medicaid, a key provision of the federal health law.

On a bright and warm Saturday morning, there's a steady flow of people dropping off donations at Martha's Table, a charity in downtown Washington, D.C. A mountain of plastic and paper bags stuffed with used dresses, scarves, skirts and footwear expands in one corner of the room. Volunteers sort and put clothes on hangers. They'll go on sale next door, and the proceeds will help the needy in the area.

It's a scene played out across the U.S.: people donating their old clothes, whether through collection bins or through large charities, to help others.

Opponents of expanding background checks for gun sales often raise the fear that it would allow the government to create a national gun registry — a database of gun transactions. In fact, federal law already bans the creation of such a registry. And the reality of how gun sales records are accessed turns out to be surprisingly low-tech.