Which preposition to use with soilers

like Occurrences 1%

And I think that, even were the trifling difficulty of the lady's consent overcome, I could not easily assume the role of savior of my country before the time of the departure of the next ship for Europeeven granted my enemies, the Whigs, will give a mission to an ex-Democrat and a Free Soiler like myself!"

with Occurrences 1%

The slavery issue had brought him into politics; he had been elected to the United States Senate by the coalition of a small number of Free-soilers with the Democrats in the Massachusetts Legislature.

Which preposition to use with  soilers