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Woman, bundling up against the wind, holding a sign supporting the ColoradoCare initiative.

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Senator Bernie Sanders waiting to speak at a rally for a ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders waiting to speak at a rally for a ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders with National Nurses United Director RoseAnn DeMoro at a rally for the ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders speaking at a rally for a ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders gestures while speaking at a rally for a ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders gestures while speaking at a rally for a ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders gestures while speaking at a rally for a ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders speaking at a rally for a ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders gestures while speaking at a rally for a ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders gestures while speaking at a rally for a ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders gestures while speaking at a rally for a ColoradoCare health care initiative in Boulder.

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Senator Bernie Sanders walks through crowd of supporters after speaking at a health care initiative rally in Boulder Colorado, many people raise cell phones to take pictures.

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Mother with arms around young son standing in front of her at health care initiative rally.

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Attendees at health care initiative rally standing and applauding.

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Cardboard cut-out of Bernie Sanders standing in crowd of spectators at health care initiatve rally in Boulder Colorado.

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Cardboard cut-out of Bernie Sanders standing in crowd of spectators at health care initiatve rally in Boulder Colorado.

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Two women applauding at health care initiative rally, young boy standing in front of them.

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Women at healthe care initiative rally taking pictuires with cell phones.

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Attendees at health care initiative rally listen to speaker.

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Woman taking picture with cell phone at rally for the ColoradoCare initiative.

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Attendees at health care initiative rally shouting and applauding after Senator Bernie Sanders finished speaking.

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Attendees at health care initiative rally standing and applauding.

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Volunteers for the ColoradoCare health care initiative speak to people attending a rally.

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Volunteers for the ColoradoCare health care initiative speak to people attending a rally.

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Hillary Clinton supporter holdong up a t-shirt that reads "Shut The Trump Up".

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National Nurses United Director RoseAnn DeMoro speaking at a rally for the ColoradoCare health care initiative in Boulder.

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National Nurses United Director RoseAnn DeMoro speaking at a rally for the ColoradoCare health care initiative in Boulder.

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State Senator and doctor, Irene Aguilar speaking at a rally for the ColoradoCare initiative in Boulder.