Protesters for Arn Menconi, a Green Party candidate for the U.S. Senate, rallied outside of the 9NEWS debate on Tuesday night.
Menconi did not reach the threshold -- 10 percent of the polls -- to participate in the only televised debate.
The protesters were heard during the broadcast, banging on the History of Colorado Center and yelling in support of Menconi.
PHOTOS: Menconi protesters outside of senate debate
Incumbent Sen. Michael Bennet (D-Colorado) were invited to debate on stage with Republican challenger Darryl Glenn, who currently serves as an El Paso County Commissioner.