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An estimated 800,000 to 900,000 people are expected to flood the nation's capital on Friday for the inauguration, but it is unclear whether they will be there in celebration or protest, officials said.
President Barack Obama drew an estimated 1.8 million people to Washington when he took office eight years ago.
The "level of enthusiasm" and demand for hotel rooms has not reached that of previous inaugurations, according to Elliott Ferguson, president of Destination DC, the city's convention and tourism bureau.
In fact, some hotels have reduced the minimum-night stay from four nights to two.