The "National Prayer Breakfast" comes from a strange group with very murky beginings. When you research this you'll find a tie to "The Fellowship" "Alcoholic Annonomous" "Promise Keepers" and other quaisi-religious political and charitable organizations. They often united in "common cause" with cults, non-christians, and neo-conservatives to push "moral" issues.

See:

http://www.orange-papers.org/orange-rroot900.html
(Pastor H.A. Ironside's sermon on why Buchman's "moral re-armament" group is not true Christianity).

http://www.insider-magazine.com/ChristianMafia.htm
(This "expose" of the "Prayer Breakfast" group and its history is VERY liberal and can be taken with a grain of salt - make that a shaker of salt! - but what it is good for is to see how when Christians unite with questionable groups with neo-nazi/fascist sympathies, the Christians ruin their witness, and get tarred and feathered, as this author attempt to do)

The "Prayer Breakfast" group (see more about Buchman and the history of it at this link http://www.orange-papers.org/ (again, use discernment about some of the information)) has a penchant for seaking out notable celebrities and politicians.

The use of the rock star Bono, who evidently is a Christian, would fit. However, if your pastor is showing video clips of Bono in order to get people on the social gospel kick, that is a very bad sign.  I'd stick with the Bible and forget the dopey rock stars. They say Britany Spears is also a Christian. And Elvis was, too. As the Jews say, "Oy vey!"