Frisco, a black labrador, is seen next to a placard supporting Democratic U.S. presidential candidate Bernie Sanders at a campaign rally in San Francisco, California, U.S. June 6, 2016. (Photo by Elijah Nouvelage/Reuters)





Sarah Weismer, of Long Beach, holds a sign supporting Democratic U.S. presidential candidate Bernie Sanders at a campaign rally in San Francisco, California, U.S. June 6, 2016. (Photo by Elijah Nouvelage/Reuters)





A supporter of Democratic U.S. presidential candidate Bernie Sanders shows off his Bernie tattoos at a campaign rally in San Francisco, California, U.S. June 6, 2016. (Photo by Elijah Nouvelage/Reuters)





A t-shirt of a supporter of Democratic U.S. presidential candidate Bernie Sanders is adorned with pins at a campaign rally in San Francisco, California, U.S. June 6, 2016. (Photo by Elijah Nouvelage/Reuters)





Democratic U.S. presidential candidate Bernie Sanders greets a supporter dressed as the Mad Hatter on Hollywood Boulevard in Hollywood, Los Angeles, California, U.S., June 7, 2016. (Photo by Lucy Nicholson/Reuters)





Supporters write on themselves as they wait to enter a rally where Democratic U.S. presidential candidate Hillary Clinton will appear to celebrate her California primary night in the Brooklyn borough of New York, U.S., June 7, 2016. (Photo by Lucas Jackson/Reuters)





Supporters wait to enter a rally where Democratic U.S. presidential candidate Hillary Clinton will appear to celebrate her California primary night in the Brooklyn borough of New York, U.S., June 7, 2016. (Photo by Lucas Jackson/Reuters)





A volunteer holds a sign directing supporters towards the entrance of a rally where Democratic U.S. presidential candidate Hillary Clinton will appear to celebrate her California primary night in the Brooklyn borough of New York, U.S., June 7, 2016. (Photo by Lucas Jackson/Reuters)





Theresa “Omarosa” Manigault, of Republican U.S. presidential candidate Donald Trump's reality TV show “The Apprentice”, poses with other Trump supporters as they await his arrival at a campaign event on the day that several states held presidential primary elections, including California, at the Trump National Golf Club Westchester in Briarcliff Manor, New York, U.S., June 7, 2016. (Photo by Mike Segar/Reuters)





Supporters await the arrival of Republican U.S. presidential candidate Donald Trump at a campaign event on the day that several states held presidential primary elections, including California, at the Trump National Golf Club Westchester in Briarcliff Manor, New York, U.S., June 7, 2016. (Photo by Mike Segar/Reuters)





Supporters of Donald Trump pose for selfies as they await his arrival at his campaign headquarters on the day that several states held presidential primary elections, including California, at the Trump National Golf Club Westchester in Briarcliff Manor, New York, U.S., June 7, 2016. (Photo by Mike Segar/Reuters)





U.S. Democratic presidential candidate Bernie Sanders greets supporters in Los Angeles, California, U.S. June 7, 2016. (Photo by Lucy Nicholson/Reuters)





Republican U.S. presidential candidate Donald Trump speaks while accompanied by his daughter Ivanka (L) and wife Melania (R) at a campaign event on the day that several states held presidential primary elections, including California, at the Trump National Golf Club Westchester in Briarcliff Manor, New York, U.S., June 7, 2016. (Photo by Mike Segar/Reuters)





U.S. Democratic presidential candidate Bernie Sanders greets supporters in Los Angeles, California, U.S. June 7, 2016. (Photo by Lucy Nicholson/Reuters)





U.S. Democratic presidential candidate Bernie Sanders greets supporters in Los Angeles, California, U.S. June 7, 2016. (Photo by Lucy Nicholson/Reuters)





A supporter shows off a tattoo as she awaits an appearance by Democratic U.S. presidential candidate Bernie Sanders following the closing of the polls in the California presidential primary in Santa Monica, California, U.S., June 7, 2016. (Photo by Mario Anzuoni/Reuters)





A supporter holds a sign and a Sanders doll while awaiting an appearance by Democratic U.S. presidential candidate Bernie Sanders following the closing of the polls in the California presidential primary in Santa Monica, California, U.S., June 7, 2016. (Photo by Mario Anzuoni/Reuters)





The images of U.S. Democratic presidential candidate Hillary Clinton (L) and Republican Presidential candidate Donald Trump are seen painted on decorative pumpkins created by artist John Kettman in LaSalle, Illinois, U.S., June 8, 2016. (Photo by Jim Young/Reuters)





A man stands with paintings of Democratic presidential candidate Sen. Bernie Sanders, I-Vt., before a rally Tuesday, June 7, 2016, in Santa Monica, Calif. (Photo by John Locher/AP Photo)