Signing a petition at a rally for health care reform in Denver.

Senior woman wearing brace on hand signing paper on clipboard.

Young man with dreadlocks signing paper on clipboard, other person signing in background.

Woman signing petition on clipboard.

Woman signing paper on clipboard, volunteer wearing Hillary Clinton button and holding book, looks on.

Young woman wearing Hillary Clinton buttons shows paper on clipboard to woman holding Hillary Clinton book.

Young woman with Hillary Clinton stickers around her neck shows paper on clipboard to woman holding Hillary Clinton book.

Woman wearing Hillary Clinton button, holding clipboard.

Young woman holding clipboard and Hillary Clinton book.

Woman signing paper on clipboard, young woman wearing Hillary Clinton button standing next to her.

Man holding clipboard and Hillary Clinton buttons gestures with hand.

Man holding clipboard and Hillary Clinton stickers gives sticker to man holding Clinton book.

wearing Hillary Clinton button smiles as another woman holding Clinton book signs paper on clipboard.

Man holding clipboard and Hillary Clinton stickers gives sticker to man holding Clinton book.

Woman points to petition on clipboard being held by young man, other woman beside her.

Young man signs petition on clipboard, in background petitioner holds clipboard for person signing.

Woman leans over to sign paper on clipboard on table.

Woman leans over to sign a paper on clipboard on a table.

Woman in "sun" costume holds box of petitions supporting rooftop solar energy, to be delivered to the offices of utility corporation Xcel Energy in Denver.

Man holding sign opposing war with Iran, woman in foreground signing prtition.

Woman signing petition.

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Registering voters on the University of Colorado Boulder campus. (10/1/08)

Registering voters on the University of Colorado Boulder campus. (10/1/08)

Registering voters on the University of Colorado Boulder campus. (10/1/08)

Denver area residents sign petition to abolish "corporate personhood". (1/20/12)

Denver area residents sign petition to abolish "corporate personhood". (1/20/12)

Denver area residents sign petition to abolish "corporate personhood". (1/20/12)

Registering voters on the University of Colorado Boulder campus. (10/1/08)

Registering voters on the University of Colorado Boulder campus. (10/1/08)

Registering voters on the University of Colorado Boulder campus. (10/1/08)

Denver area residents gather signatures on a petition to abolish "corporate personhood". (1/20/12)

Jobs With Justice activist leaflets outside Verizon store in downtown Denver. (12/10/11)

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Custodians at the Auraria Higher Education Center in Denver, demonstrate over wage cuts, workplace harassment & intimidation, and safety issues.

Supporters of the Fair Food Program rallied at Regis University in Denver, then marched to a nearby Wendy's.

Supporters of the Fair Food Program rallied at Regis University in Denver, then marched to a nearby Wendy's.

Rooftop solar energy supporters sign petitions against utility company Xcel Energy's metering policies.

Rooftop solar energy supporters sign petitions against utility company Xcel Energy's metering policies.

Woman speaking from a podium, testifying at a County Commissioner's meeting about fracking, in front of her one County Commissioner and staff person.

Three Boulder County Commissioners listening to testimony about fracking.