The cathedrals in the West Wing

There is an episode of the West Wing called Two Cathedrals. I know one is the Anglican Washington National Cathedral. Does anyone know what the other one refers to?

National Shrine of the Immaculate Conception?

St. Matthew?

I understood it to be a metaphorical cathedral, where the president was bishop or pontiff or whatever. In other words, the cathedral of democracy, or the White House, or something along those lines.

Oh I see

Just popping in to concur with this one. Martin Sheen uses that metaphor a lot on the show, and I think the second cahtedral was indeed meant to be the White House.

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