Nancy Weaver, 60, a Bachmann supporter, poses for a portrait at the Candyland Station Soda Fountain on Thursday, December 29, 2011 in Grinnell, Iowa. She favors Representative Michelle Bachmann because the congresswoman raised 23 foster children. "That's a huge endeavor for any man or woman." Patrick T. Fallon/For The New York Times

Dwayne Kriegel, 50, outside his home on Thursday, December 29, 2011 in Grinnell, Iowa. He is backing Rick Santorum in Tuesday's caucus. łHeąs passionate about his dedication to family values,˛ Mr. Kriegel said. łThe others say what they think the voters want to hear, while he lives it."© Patrick T. Fallon/For The New York Times

Attorney Michael Dee poses for a portrait overlooking downtown Des Moines on Thursday, December 29, 2011 in Des Moines, Iowa. He plans to support Mitt Romney. Patrick T. Fallon/For The New York Times

Nancy Weaver, 60, poses for a portrait at the Candyland Station Soda Fountain on Thursday, December 29, 2011 in Grinnell, Iowa. Patrick T. Fallon/For The New York Times

Dwayne Kriegel, 50, poses for a portrait outside his home on Thursday, December 29, 2011 in Grinnell, Iowa. Patrick T. Fallon/ for The New York Times