The North Korean leader's trip comes as ties between Beijing and Washington are being tested by a major trade dispute.
The ISIS-linked sect has been involved in around 30,000 killings over the past decade.
"I need to have that weapon on me at all times in case something would happen," an Ohio teacher said. "I know the other teachers feel the same way."
Voters will choose a Parliament as well as a president on Sunday, and polls suggest both elections will be closer than expected.
"When I saw their bleeding and blistered feet, I could not control my tears so I decided to join them," one participant said.