Can there be that many, though? Are there really enough people who can ignore how much of a disaster this would be? That remains to be seen. 
YES. There can be that many. We're seeing a lot of repub base voters, and many anti-establishment dem voters, that are so ill-educated on politics, on manners, on global issues, on the economy, and on the candidates themselves...
They're just voting for random, chaotic change. To shake things up. They want to just change everything in some delusion that it'll "fix everything". Change for change's sake. And it could be disastrous.
They don't realize that a manic president can start wars, if he wants. They don't catch on that 'mixing it up' on the world stage can result in some insane trade sanctions.
They're stupid. They're just plain stupid. Anyone smiling at trump saying "hey, he's crazy, but change is good" is an outright buffoon. Period. And it's both repubs and dems doing it now. They're ignorant and dangerous people, and they're all around us lol.