Here's the Atlantic as a source. That's a good one!
And another long article:
Take TwoMost of the prayer groups are informally affiliated with a secretive Christian organization called the Fellowship, established in the 1930s by a Methodist evangelist named Abraham Vereide, whose great hope was to preach the word of Jesus to political and business leaders throughout the world. Vereide believed that the best way to change the powerful was through discreet personal ministry, and over his lifetime he succeeded to a remarkable degree. The first Senate prayer group met over breakfast in 1943; a decade later one of its members, Senator Frank Carlson, persuaded Dwight Eisenhower to host a Presidential Prayer Breakfast, which has become a tradition.
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Hillary Clinton’s proficiency in this innermost sanctum has unnerved some of the capital’s most exalted religious conservatives. “You’re not talking about some tree-hugging, Jesus-is-my-Buddha sort of stuff,” says David Kuo, a former Bush official in the Office of Faith-Based and Community Initiatives, who worked with Clinton to promote joint legislation and who, like Brownback, has apologized to her for past misdeeds. “These are powerful evangelicals she’s meeting with.” Like many conservatives, they are caught between warring dictates of their faith: the religious one, which requires them to embrace a fellow Christian, and the political one, more powerful in some, which causes them to instinctively distrust the motives of a Clinton. Everyone in Washington experiences their dilemma at one time or another—the lack of an Archimedean point from which to judge Hillary Clinton.
http://www.theatlantic.com/doc/200611/green-hillary