FILE - In this March 22, 2012 file photo, then-Republican presidential candidate, former Pennsylvania Sen. Rick Santorum fiddles with an Etch-A -Sketch as he speaks in San Antonio. The Republican primary campaign is already fading into memory. Remember Herman Cain's 9-9-9 tax plan? Newt Gingrich's "moon base" proposal? Or Rick Perry's "oops" moment _ when he couldn't recall that third federal agency he wanted to eliminate? (AP Photo/Eric Gay, File)

Associated Press
FILE - In this March 22, 2012 file photo, then-Republican presidential candidate, former Pennsylvania Sen. Rick Santorum fiddles with an Etch-A -Sketch as he speaks in San Antonio. The Republican primary campaign is already fading into memory. Remember Herman Cain's 9-9-9 tax plan? Newt Gingrich's "moon base" proposal? Or Rick Perry's "oops" moment _ when he couldn't recall that third federal agency he wanted to eliminate?   (AP Photo/Eric Gay, File)
FILE - In this March 22, 2012 file photo, then-Republican presidential candidate, former Pennsylvania Sen. Rick Santorum fiddles with an Etch-A -Sketch as he speaks in San Antonio. The Republican primary campaign is already fading into memory. Remember Herman Cain's 9-9-9 tax plan? Newt Gingrich's "moon base" proposal? Or Rick Perry's "oops" moment _ when he couldn't recall that third federal agency he wanted to eliminate? (AP Photo/Eric Gay, File)
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