Similar to this question, I would like to asterisk certain citations in the reference list but using style=chicago-authordate instead of apa. For some reason that I do not know, this small change eliminates the asterisks. The MWE from that question is a good example here as well:
\documentclass[american]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{lmodern}
\usepackage{babel}
\usepackage{csquotes}
\usepackage[backend=biber, style=apa]{biblatex}
\DeclareLanguageMapping{american}{american-apa}
\usepackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@book{bohec,
author = {Le Bohec, Yann},
title = {Histoire militaire des guerres puniques},
date = {1996},
location = {Monaco},
publisher = {Rocher},
isbn = {2-268-02147-5},
}
@book{uthor,
author = {Uthor, Arnold},
title = {A Book},
date = {2013},
location = {Place},
publisher = {P. Ublisher's \& Co.},
}
\end{filecontents*}
\addbibresource{\jobname.bib}
\addbibresource{biblatex-examples.bib}
\DeclareBibliographyCategory{asterisk}
\renewbibmacro*{begentry}{%
\ifcategory{asterisk}%
{*}%
{}%
}
\begin{document}
\addtocategory{asterisk}{uthor,bohec}
\cite{wilde,cicero,coleridge,vangennep,bohec,uthor}
\printbibliography
\end{document}