Philadelphia

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Denver Nuggets' Jameer Nelson in action during an NBA basketball game against the Philadelphia 76ers, Tuesday, Feb. 3, 2015, in Philadelphia. (AP Photo/Matt Slocum)

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Philadelphia firefighters work the scene of an overnight blaze in west Philadelphia on Monday, Feb. 16, 2015, where ice has formed from the water used to fight the fire. Bone-chilling, single-digit temperatures have gripped the region, prompting the closure of all parish and regional Catholic elementary schools in the city of Philadelphia. (AP Photo/Jacqueline Larma)

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New York Times reporter Jeremy Peters asked Democratic lawmakers on Friday why the press at the House Democratic Caucus Retreat in Philadelphia was being so closely monitored by security, with some journalists even being followed to the bathroom. (C-SPAN via Mediaite)

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President Barack Obama shakes hands with House Minority Whip Steny Hoyer, D-Md., after making opening remarks at the House Democratic Issues Conference in Philadelphia, Thursday, Jan. 29, 2015. (AP Photo/Pablo Martinez Monsivais)

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New York Knicks' Derek Fisher in action during an NBA basketball game against the Philadelphia 76ers, Wednesday, Jan. 21, 2015, in Philadelphia. (AP Photo/Matt Slocum)

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Tom Petty performs in concert with Tom Petty and the Heartbreakers during their Hypnotic Eye Tour 2014 in Philadelphia. (Photo by Owen Sweeney/Invision/AP, File)

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Pope Francis, an Argentine who has never visited the U.S., said he planned to visit Washington and New York City as part of his trip to the World Meeting of Families, which is scheduled for September in Philadelphia. (Associated Press File)

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Philadelphia Eagles defensive coordinator Todd Bowles watches from the sidelines in the second half of an NFL football game against the Cincinnati Bengals, Thursday, Dec. 13, 2012, in Philadelphia. (AP Photo/Michael Perez)

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Sacramento, California, Mayor Kevin Johnson (left) and Philadelphia Mayor Michael Nutter (center) listen as Baltimore Mayor Stephanie Rawlings-Blake speaks Tuesday at the President's Task Force on 21st Century Policing at the Newseum in Washington. (associated press)

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In this Aug. 19, 2013 file photo, a Philadelphia business displays a help wanted sign in its storefront. With the price of oil below $50 a barrel, consumers will have steadily more money to spend, potentially creating job openings at retailers, auto dealers, shipping firms, restaurants and hotels. (AP Photo/Matt Rourke, File)

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Seattle Seahawks' Russell Wilson scores a touchdown during the first half of an NFL football game against the Philadelphia Eagles, Sunday, Dec. 7, 2014, in Philadelphia. (AP Photo/Michael Perez)

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Customers shop at the Century 21 department store in Philadelphia. Retailers are enjoying increased pre-holiday sales. (Associated Press)

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Philadelphia Eagles' Mark Sanchez is seen during an NFL football game against the Carolina Panthers on Monday, Nov. 10, 2014, in Philadelphia. (AP Photo/Michael Perez)

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Jon Huntsman, Sr., speaking at the 2004 Heritage Day Awards, Chemical Heritage Foundation, Philadelphia, Pa. (Wikipedia)

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Washington Capitals' Tom Wilson in action during an NHL hockey game against the Philadelphia Flyers, Tuesday, Dec. 17, 2013, in Philadelphia. (AP Photo/Matt Slocum)

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United States midfielder Carli Lloyd (10) celebrates her goal with teammates Megan Rapinoe (15) and Ali Krieger (11) in the first half against Mexico during a CONCACAF semifinal soccer match in Philadelphia, Pa., Friday, Oct. 24, 2014. (AP Photo/Rich Schultz)