Mary Kelly, right, of Des Moines raises her hands during musical prayer and worship with congregation members at Cornerstone Family Church leading up to the Iowa Caucuses on Sunday, January 1, 2012 in Des Moines, Iowa. Patrick T. Fallon/For The New York Times

Congregation members greet one another as they arrive for prayer and worship at Cornerstone Family Church leading up to the Iowa Caucuses on Sunday, January 1, 2012 in Des Moines, Iowa. Patrick T. Fallon/For The New York Times

Congregation members arrive for prayer and worship at Cornerstone Family Church leading up to the Iowa Caucuses on Sunday, January 1, 2012 in Des Moines, Iowa. Patrick T. Fallon/For The New York Times

Congregation member Jarvis Baker of Des Moines leaves the Cornerstone Family Church after services, leading up to the Iowa Caucuses on Sunday, January 1, 2012 in Des Moines, Iowa. Patrick T. Fallon/For The New York Times