A friend forwarded this approved prayer given by Our Lord to Sister Marie de St. Pierre (in the 19th century) against "revolutionary men." The prayer is as follows:
Let us ask also pray a Novena Rosary to Our Lady of Victory between now and our neighbours' election day, as Fr Corapi recommends.
I've taken the liberty of slightly adapting the prayer below for use by those of us who are outside the United States.
Almighty God, all things are in your hands: our nation, our communities, our families, our lives. So too the United States of America.
In this time of great decision, bless that country and its people. Prosper the efforts of the just and true, and thwart the purposes of the unjust and dishonest. Preserve their land from violence and turmoil, and keep their relationships decent and respectful.
Inspire voters, legislators, executives, and judges so their country may be a land where morality is furthered by law and authority; where life is protected, marriage is respected, and family is supported; where the innocent are spared, and the guilty are punished; where justice is tempered by mercy, and mercy fortified by justice.
Help them to keep the United States of America a land where the rule of law and respect for individual dignity are the legal foundation of a just order.
(E. L. Core, source.)