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As a possible Congressional breakthrough nears, here's what you need to understand about the Treasury's debt ceiling for now -- and next time. Photo courtesy of Flickr user Tyler Merbler.

.embed-container {position: relative; padding-bottom: 120%; padding-top: 30px; height: 0; overflow: hidden;} .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } Italian Prime Minister Enrico Letta has arrived at the NewsHour studio.