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Voters line up to cast their ballots at a polling station in Washington, DC, November 4, 2014, during the midterm elections.  With Senate control on the line, US Democrats hope they don't get steamrolled by Republicans in Tuesday's midterms, but most signs point toward President Barack Obama's party suffering crippling election setbacks. Recent polls show Republicans pulling ahead in the battle for power in Washington despite races in Alaska, North Carolina and other states remaining very close, and they expressed confidence in the home stretch of one of the most pivotal midterm elections in years. AFP PHOTO / Saul LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)
Voters line up to cast their ballots at a polling station in Washington, DC, November 4, 2014, during the midterm elections.  With Senate control on the line, US Democrats hope they don't get steamrolled by Republicans in Tuesday's midterms, but most signs point toward President Barack Obama's party suffering crippling election setbacks. Recent polls show Republicans pulling ahead in the battle for power in Washington despite races in Alaska, North Carolina and other states remaining very close, and they expressed confidence in the home stretch of one of the most pivotal midterm elections in years. AFP PHOTO / Saul LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)

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Why voting in the US is so hard

From voter registration to a tedious election process, CNN's Rachel Crane explains why voting in the United States is so difficult.

Why voting in the US is so hard

From voter registration to a tedious election process, CNN's Rachel Crane explains why voting in the United States is so difficult.