With Pope Benedict coming to visit the United States next week relations between Roman Catholics and Protestants will likely be the subject of media scrutiny. The pope's itinerary includes a visit to the White House with President Bush, a Protestant, who was re-elected with 51 percent of the Catholic vote in 2004, despite running against a Catholic.

Although certain doctrinal differences remain in place, conservative Catholics and Evangelical Christians have been drawing closer together in recent years, according to a new book that explores the growing influence of Christian voters.

Deal Hudson, the executive director of the Morley Institute for Church and Culture in Washington D.C., describes some of the key factors responsible for the convergence between conservative minded American Catholics and Protestants in his just released book.

Age old grievances have gradually receded to the point where Christians from various denominations have joined together to resist secular assaults on shared values, Hudson argues in  "Onward Christian Soldiers: The Growing Political Power of Catholics and Evangelicals in the United States."