Republican presidential candidate John Kasich's campaign is running an online ad and sent out a fundraising plea in response to the Paris attacks. Kasich is shown here at a town hall campaign event. Robert F. Bukaty/AP hide caption

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Low-wage workers and supporters protest for a $15 an hour minimum wage Tuesday in New York City as part of what organizers called a National Day of Action. Spencer Platt/Getty Images hide caption

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Former Florida Gov. Jeb Bush again needs a strong debate performance to quiet concerns that his White House campaign is struggling. Mark J. Terrill/AP hide caption

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At an event in Sioux City Tuesday night, Republican presidential candidate Donald Trump expressed astonishment that he is now trailing Ben Carson in Iowa. Nati Harnik/AP hide caption

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