Preterism has its adherents among the Theonomist faction within Presbyterianism, such as Gary North, Rousas Rushdoony, etc. R.C. Sproul was not a theonomist but has supported this view in a book he wrote about 20 years ago. Outside the Theonomists, the Churches of Christ have some members who hold to a preterist position, despite being anti-Calvinist. They are something of an outlier among low church Protestants, such as Baptists, Pentecostal, and Bible church believers, who are premillennial and dispensational, for the most part.
I was at a grace Bible church today where the pastor spoke glowingly of Augustine, the founder of both Catholicism and Calvinism (thus, by extension, preterism). He was a rather young person so I chalked it up to his sheer ignorance, a newbie from seminary.