If things had gone differently in November, Rep. Paul Ryan (R-Wis.) might have departed the Capitol on Monday as the vice president of the United States. Instead, he faced a chorus of boos as he left the building to attend President Barack Obama's second inauguration ceremony.

Ryan announced last week that he would be present for Obama's public swearing in at the Capitol, calling it his "obligation."

Ryan served as GOP presidential nominee Mitt Romney's running mate during the 2012 election cycle. Though they came up short in their loss to Obama and Vice President Joe Biden, he was reelected to his Wisconsin congressional seat in November.

UPDATE: 12:50 p.m. -- HuffPost's Ryan Grim reports that Obama got in a jab at Ryan during his inaugural address, attacking the former vice presidential candidate's "makers vs. takers" rhetoric:

For Ryan, the country is divided between "takers" and "makers." He generally puts the number of the former at around a third, with the remainder in the producing category. The dichotomy has been a regular part of his rhetorical repertoire for years, and was elevated during the presidential campaign as Ryan sought the vice presidency.

Ryan argues that social insurance programs that are central to Western welfare states sap the citizenry of ambition. Obama took direct aim at that contention on Monday. "The commitments we make to each other -- through Medicare, and Medicaid, and Social Security -- these things do not sap our initiative; they strengthen us. They do not make us a nation of takers; they free us to take the risks that make this country great," he said.

For minute-by-minute updates on the day's events, click over to our inauguration liveblog.

Also on HuffPost:

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  • First Held In Washington, D.C.

    <strong>Thomas Jefferson, 1801</strong> Jefferson's inauguration was<a href="http://www.inaugural.senate.gov/swearing-in/event/thomas-jefferson-1801"> the first to be held in the District of Columbia</a>. It was also the first inauguration the Marine Band played at. They have played at every inauguration since.

  • First Inaugural Ball

    <strong>James Madison, 1809</strong> Madison's <a href="http://www.inaugural.senate.gov/about/days-event/inaugural-ball"> first Inaugural Ball </a>was held the evening after his swearing-in ceremony. The ball took place at Long's Hotel. Tickets cost $4 each.

  • First Photographed

    <strong>James Buchanan, 1857</strong> The first known <a href="http://memory.loc.gov/cgi-bin/ampage?collId=pin_mssmisc&fileName=pin/pin2003/pin2003page.db&recNum=0">photograph</a> of an inaugural ceremony was taken at Buchanan's inauguration.

  • First Parade Allowing African Americans To Participate

    <strong>Abraham Lincoln, 1865</strong> Lincoln's <a href="http://www.inaugural.senate.gov/swearing-in/event/abraham-lincoln-1865">second inauguration</a>, which came just months after the passing of the 13th amendment, was the first that African Americans were allowed to participate in.

  • First Filmed

    <strong>William McKinley, 1897</strong> <a href="http://www.inaugural.senate.gov/swearing-in/event/william-mckinley-1897">McKinley's inauguration</a> was the first to be recorded on a motion picture camera, a new technology in the late 1800s.

  • First Held On January 20th

    <strong>Franklin D. Roosevelt, 1937</strong> Previous to FDR's second inauguration, most inaugurations were held on <a href="http://memory.loc.gov/ammem/today/jan20.html">March 4th</a>. The 20th amendment, ratified in 1933, mandated that all future inaugurations be held on January 20th.

  • First Televised

    <strong>Harry S. Truman, 1949</strong> Truman's <a href="http://www.inaugural.senate.gov/swearing-in/event/harry-s-truman-1949">inauguration</a> was the first to be broadcast on television, letting audiences across the nation take part in viewing the ceremony.

  • First Airplane Inauguration

    <strong>Lyndon B. Johnson, 1963</strong> Following the assassination of John F. Kennedy, Johnson was <a href="http://www.inaugural.senate.gov/swearing-in/event/lyndon-baines-johnson-1963">sworn in</a> to office on Air Force One in Dallas - making his inauguration the only one to ever be held on a plane.

  • First Internet Broadcast

    <strong>Bill Clinton, 1997</strong> Clinton's <a href="http://www.inaugural.senate.gov/swearing-in/event/bill-clinton-1997">second inauguration</a> was the first ever to be streamed online.

  • First Emceed By A Woman

    <strong>Barack Obama, 2009</strong> <a href="http://www.inaugural.senate.gov/swearing-in/event/barack-obama-2009">Obama's inauguration</a> was emceed by California Sen. Dianne Feinstein (D-Calif.), the first woman to ever emcee an inauguration. His inauguration also had the largest attendance of any event ever held in D.C. and had the highest online viewership ever.