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President Barack Obama talks with Tom Grilk, head of the Boston Athletic Association, as he greets first responders and marathon volunteers at Cathedral High School in Boston, Mass., April 18, 2013. The President and First Lady Michelle Obama traveled to Boston to attend an interfaith prayer service dedicated to the victims of the Boston Marathon bombings.

President Barack Obama talks with Tom Grilk, head of the Boston Athletic Association, as he greets first responders and marathon volunteers at Cathedral High School in Boston, Mass., April 18, 2013. The President and First Lady Michelle Obama traveled to Boston to attend an interfaith prayer service dedicated to the victims of the Boston Marathon bombings.

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Year in Review: Politics of polarization dominated U.S. news

On the national stage, the politics of polarization were on display with Democrats and Republicans locking horns over the roll-out of the Affordable Care Act, voting rights laws and myriad other issues.