Francis' attention to poverty has also captured the attention of Republicans, prompting some to stake out high-profile anti-poverty positions.
House Speaker John Boehner, R-Ohio, has extended a formal and open invitation to the pope to address Congress when he visits the United States.
No doubt there is a political dimension to Obama's visit as well.
The president won the Catholic vote in both of his elections, helped by heavy support from Hispanic Catholics. Some of that support has waned since.
Meanwhile, the Pew Research Center found that the pope remains hugely popular, with more than 8 in 10 U.S.
Catholics saying they have a favorable view of the pontiff.