US Democratic presidential candidate Bernie Sanders addresses a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
Supporters listen as US Democratic presidential candidate Bernie Sanders addresses a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, Feb. 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
US Democratic presidential candidate Bernie Sanders arrives for a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
US Democratic presidential candidate Bernie Sanders arrives for a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
Democratic presidential candidate Bernie Sanders speaks at a rally at Colorado State University's Moby Arena in Fort Collins on Feb. 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
US Democratic presidential candidate Bernie Sanders arrives for a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
US Democratic presidential candidate Bernie Sanders arrives for a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
US Democratic presidential candidate Bernie Sanders arrives for a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
US Democratic presidential candidate Bernie Sanders arrives for a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
Democratic presidential candidate Bernie Sanders addresses a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
US Democratic presidential candidate Bernie Sanders addresses a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
US Democratic presidential candidate Bernie Sanders arrives for a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
US Democratic presidential candidate Bernie Sanders greets supporters after addressing a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
A supporter holds a sign during a raly for US Democratic presidential candidate Bernie Sanders at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
Democratic presidential candidate Bernie Sanders addresses a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
A supporter of Democratic presidential candidate Bernie Sanders holds "Bernie Wands" while attending a rally in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
Democratic presidential candidate Bernie Sanders addresses a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
Democratic presidential candidate Bernie Sanders addresses a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
Supporters cheer as Democratic presidential candidate Bernie Sanders addresses a capacity crowd at Colorado State University's Moby Arena in Ft. Collins, Colorado, February 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
Supporters wait to greet Democratic presidential candidate Bernie Sanders at the end of a rally at Colorado State University's Moby Arena in Ft. Collins, Colorado, Feb. 28, 2016. (credit: JASON CONNOLLY/AFP/Getty Images)
Bernie Sanders Rally In Fort Collins
Drew Romano (C) of Boulder, Colorado, cheers as Democratic presidential candidate Bernie Sanders addresses a capacity crowd at Colorado State University's Moby Arena in Ft. Collins on February 28, 2016. (credit should read JASON CONNOLLY/AFP/Getty Images)