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WASHINGTON, DC - FEBRUARY 10:  Callista Gingrich introduces her husband, Republican presidential candidate and former Speaker of the House Newt Gingrich, during the Conservative Political Action Conference (CPAC) at the Marriott Wardman Park February 10, 2012 in Washington, DC. Thousands of conservative activists are attending the annual gathering in the nation's capital.  (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - FEBRUARY 10:  Callista Gingrich introduces her husband, Republican presidential candidate and former Speaker of the House Newt Gingrich, during the Conservative Political Action Conference (CPAC) at the Marriott Wardman Park February 10, 2012 in Washington, DC. Thousands of conservative activists are attending the annual gathering in the nation's capital.  (Photo by Win McNamee/Getty Images)

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    Callista Gingrich to be ambassador to Vatican

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Callista Gingrich to be ambassador to Vatican

The White House is expected to nominate Callista Gingrich as the US ambassador to the Vatican ahead of his meeting with Pope Francis.

Callista Gingrich to be ambassador to Vatican

The White House is expected to nominate Callista Gingrich as the US ambassador to the Vatican ahead of his meeting with Pope Francis.