Obama tells Pope Francis he is a 'great admirer'

“Sometimes in these meetings there are compatible personalities,” said Paul Begala, a former aide to President Bill Clinton and a Catholic himself. He recalled being with Clinton when the president met John Paul II in Denver.

“They were only supposed to meet alone for five minutes,” he said in an interview earlier this year.

“Those two gregarious, charismatic men sat in that room for an hour without another soul in there.”

The Obama-Francis chemistry remains to be seen, but thematically both seem to be on some of the same pages.

Philadelphia Archbishop Charles Chaput, at the Vatican this week trying to secure Francis' attendance in Philadelphia next year, said he expected the Obama-Francis meeting to be good for both the U.S. and the Vatican.

“We have the most important religious figure in the world as part of that meeting, and one of the most important political leaders, so anytime the church and politics come together is an important moment for dialogue, discussion and the commitment to the common good,” Chaput told reporters Tuesday at the Vatican.