President Obama's public swearing-in ceremony and parade may have been full of pageantry, but the inauguration wasn't much of a draw on television. About 20.6 million people tuned in to watch as Obama repeated his oath for a second term at the U.S. Capitol on Monday, according to Nielsen, the TV ratings company. That's way down from the nearly 37.8 million people who watched the nation's first black president take office in 2009.