Both the U.S. president and first lady, Barack and Michelle Obama are set to debut as well.

WSJ: What Do Mother Teresa and Oprah Have in Common? Big Heads in Korea

On Tuesday -- two days before President Barack Obama and first lady Michelle Obama head to Waco, about 18 miles south, for a memorial service at Baylor University -- some of them stood motionless on their front lawns, taking in the devastation.

CNN: Powerful Texas blast left nearly 100-foot-wide crater

President Barack Obama and his wife, Michelle Obama, will attend a Wednesday memorial service and visit with victims' families at the University of Arizona in Tucson, according to a statement from the school.

CNN: STORY HIGHLIGHTS

He has known Barack and Michelle Obama for a number of years.

CNN: Emanuel expected to bring 'tough-minded' approach to White House

After winning the election, Barack Obama posted a photo of himself and Michelle Obama embracing on Facebook and Twitter.

FORBES: Big Bird or Big Challenges: What Was This Election Really About?

And Barack will have with him a terrific partner in Michelle Obama.

CNN: Clinton: It is time to take back the country we love

And when Barack Obama takes office in January, his wife, Michelle, will also make history as the country's first African-American first lady.

NPR: Look For First Lady To Champion Working Women