Cabinet members are gathered in the U.S. Capitol for the inauguration. Even though this isn't President Obama's first term, their enthusiasm hasn't subsided.

"It is always an exciting day, but now it is like you already won the Super Bowl and you have to get out there and win the next game," says outgoing Secretary of Defense Leon Panetta.

Fun Inauguration Facts: George Washington's 1793 inaugural address was the shortest at 135 words. William Henry Harrison's in 1841 was the longest at 8,445 words.

You can read more facts in our story on the five most memorable Inaugural addresses.

Senate Minority Leader Mitch McConnell of Kentucky congratulated President Barack Obama on his second term despite their political differences and the obstacles facing the political landscape in the coming months.

"Every four years on Inauguration Day, America shows the world that our major political parties can disagree with civility and mutual respect. It is in this spirit that I congratulate President Obama on his inauguration to a second term and wish him well in the fulfillment of his duty to lead the U.S. at home and abroad over the next four years," McConnell said in a released statement.

"The President's second term represents a fresh start when it comes to dealing with the great challenges of our day; particularly, the transcendent challenge of unsustainable federal spending and debt. Republicans are eager to work with the President on achieving this common goal, and we firmly believe that divided government provides the perfect opportunity to do so. Together, there is much we can achieve."

As they filed into their inaugural luncheon, members of Congress on both sides remarked at how much they enjoyed the president's brief and direct speech.

"He touched on a theme that was essential to this country, and that is working together," says House Minority Whip Steny Hoyer of Maryland.

"My favorite part of the ceremony was the president's short speech. It was very important, " says Iowa Republican Sen. Chuck Grassley.

"I hope from the bully pulpit that he will preach unity instead of dividing between Republicans and Democrats, the rich and the poor."

Marilyn Porter came from Chicago to see President Obama's first inauguration in 2009, and she was back again Monday. Porter says the second inauguration feels "more meaningful" because of the job Obama has left to do.

"It's about getting people together, it's not about politics and money, and it's about getting our representatives on board," Porter said of his second term.

The inaugural luncheon is a tradition that has spanned more than 100 years. The luncheon this year is hosted by New York Democratic Sen. Chuck Schumer and many of the wines he selected from his home state.

Here is the menu:

First Course: Steamed Lobster with New England Chowder

Anthony Road Winery, Fox Run Vineyards & Newt Red Cellars, Tierce 2010 Dry Riesling, Finger Lakes, NY

Second Course: Hickory Grilled Bison with Wild Huckleberry Reduction and Red Potato Horseradish Cake

Bedell Cellars, 2009 Merlot, North Fork, Long Island

Third Course: Hudson Valley Apple Pie, Sour Cream Ice Cream, Aged Cheese and Honey

Korbel Natural, Special Inaugural Cuvée Champagne, California

With more than 600,000 visitors in town for inauguration, the city's transportation systems are all overburdened.

The Washington Metro Area Transit Authority says that four subway stations have been closed due to crowding.

The congressional luncheon concluded with a series of speeches and toasts.

Tennessee Republican Sen. Lamar Alexander presented the official photograph of the inauguration, saying it would provide proof to Obama's great-grandchildren that the day happened.

House Speaker John Boehner delivered a toast and House Majority Leader Eric Cantor presented Obama and Vice President Joe Biden with crystal vases as an inauguration gift.

New York Democratic Sen. Chuck Schumer toasted Biden, calling him Obama's "true partner" and adding that he fills many roles for the president, including "strategist," "friend," and "advisor."

Biden gave his toast to Schumer, although many thought he was toasting the president for most of it. The joke was revealed at the end when he said "a man who never, never, never operates out of fear but out of confidence, and I am toasting you Chuck."

First lady Michelle Obama and Boehner decided the president's luncheon was running a bit long, so Obama kept his own speech brief.

"I recognize that democracy is not always easy," Obama said while thanking congressional leaders. "There is controversy about the quality of the president, but there is no controversy about the quality of the first lady," Obama concluded, thanking his wife for her support.