Do you think the mysterious powers of witchcraft could help a presidential candidate win an election?

Nope.
Science has repeatedly proven that the only "power" spells/prayers/curses/blessings/etc have ... are over those who believe such things have power, and know that one is being cast on them.

So even if Trump televised a witch casting a spell to elect him President, it would only work on people who believed in such spells.

Don't mess with the Universe, Trump.

Remember Hitler and the Swastika.

The Swastika answered Hitler.

I wouldn't screw with that stuff if I were you or him. Using magic of any kind always costs the user something.

The Spirit Cooking didn't seem to help Hillary. 

I've always imagined the weird witchy types to be more left leaning..

Many world leaders including royalty have had their horoscopes read by clairvoyants. this is because the zodiac as seen in the sky, is said to affect mans destiny below it, since the celestial realm and the earth's axis are closely interrelated. Many of the great minds of the ages including Carl Jung, Freud, Newton, Plato, Socrates, Descartes, Bacon, Pythagorus were alchemists, and also believed in demon/genius or/and tutelary deity. Alchemists are not just about changing base metals, but changing themselves in order to find the philosophers stone.  They believed in using different practices to alter their perception of reality and get in touch with a realm that is not seen by the average individual, this is the occult (hidden). Dreaming was once including in the senses and was deemed just as important, and many scientists have made discoveries through dreaming often associated with religious symbolism, the atom came from the image of the Ouroboros, which is Egyptian which isn't surprising because the mysteries have a history that extends right back to the beginning of civilisation and the great minds have used this in the great work to control human evolution. Unfortunately, very few people trace the linage of the great minds to find this wisdom for themselves. Jung was influenced by the Secret Of The Golden Flower a Chinese alchemist text which is what our current psychological principle is on, Alice Bailey is the current occult influence on psychology. Our current materialism kills spiritual development which is what it is meant to do.

And of course you have the four elements in Ezekiel as the four fixed signs of the zodiac, earth, water, wind and fire.

A mandala can be used personally, the mind is "a microcosm representing various divine powers at work in the universe, and also represents the entire universe, which is traditionally depicted with Mount Meru as the axis mundi in the center, surrounded by the continents.  The axis mundi is the world tree, the connection between heaven and earth.  The universal soul is the atman.  It's interesting stuff and worth a look.

It depends on which witch you ask.  The people I know who are witches said they wouldn't cast spells to help or hurt a presidential candidate or any other politician.  They think that's a waste of a spell.

anything is possible