Entertainment TonightBarack Obama's inauguration generated an impressive number of viewers, just how many people tuned in to watch as the new president was sworn in to the Oval Office?With nearly 38 million viewers, President Obama's inauguration was the most watched since Ronald Reagan's inauguration Day in 1981, according to the Associated Press.The number of viewers was the highest during the afternoon when Obama took the oath of office and delivered his inaugural address, AP reports.Although Reagan's inauguration telecast still holds the record with 41.8 million viewers, Obama more than doubled the number of viewers (15.5) during George W. Bush's second inauguration in 2004.