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Hillary Clinton filed her candidacy paperwork in New Hampshire on Monday, officially entering the Democratic race in the early primary state and kicking off what will likely be her most challenging primary battles.

Clinton joins Bernie Sanders and Martin O'Malley, both of whom filed their candidacies last week. Along with the filing papers Clinton, submitted a $1,000 check in order to get on the state's ballot. Hundreds of supporters gathered at the New Hampshire state house.

During subsequent questions from reporters, when Clinton was asked how it feels to be inevitable, a word once used to describe her failed 2008 campaign, she responded, "That is not how it feels. I am back again and I intend to do everything I can to be successful this time."

For months, Clinton and Sanders have competed for the first place in the "First in the Nation" primary state, with Sanders having an advantage over Clinton most of the time. The Democratic socialist does well in New England state due to his long career in neighboring Vermont. Sanders currently leads Clinton 44-42.7 in the state.

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