Obama is just now completing his speech at the prayer breakfast and he quoted CS Lewis in support of his notions of a Christian in government.
Clearly, someone at the White House is doing some research. I for one doubt very much that Obama has ever read Lewis beyond the quote he used. Here is what Obama quoted:
“Christianity has not, and does not profess to have a detailed political program. It is meant for all men at all times, and the particular program which suited one place or time would not suit another.”