Forty million people pass through Washington D.C.'s Union Station annually. They are tourists, business travelers and working locals using intercity trains, regional commuter rail lines, Washington's subway system or intercity buses. That makes 80 million eyes noticing the many ads in Union Station competing for attention. These ads sell doughnuts, pretzels, hamburgers, clothes, watches and the like. Some ads are directed at congressional, federal agency, association, think tank and media staff that are members of the Washington policy workforce and regularly pass through Union Station. A deeper scan of the content of these ads can reveal hot policy issues. The total number and prominence of the ads also indicate the high financial stakes in some policy debates.
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