The New York Times notes that the move is part of the Republican effort to make Romney more appealing to voters. He's also moving to embrace his religion publicly for the first time on the campaign trail.
How to approach his religion, a topic that he usually avoids speaking about beyond the most general terms, is a question that has long divided his campaign staff. But in the end, they decided to confront it head on. In addition to the invocation, Mr. Romney’s work as a bishop in the Mormon Church will be on display.
Despite concerns that his religion might alienate evangelicals and other conservatives, Mr. Romney and his advisers hope that his faith ultimately will be seen as a sign of strength of character, and his time as bishop as an example of his willingness to serve when called.