He didn't engineer a utopia; he plotted the course of a happy life. If he has an heir among political theorists, we should look not to Marx, but to Thomas Jefferson.
For sure, this is the central criticism of Marx(ism) and also of a lot of other authors on Epicurus: The garden philosopher didn't construct an utopia that tries to change the world politically. But it doesn't mean that Marx wasn't inspired by his intensive reading of writings of Epicurean descent. The only question is to what degree Marx got influenced by Epicurus. But this question is very hard to answer. I would never believe Marx to be an Epicurean, but I believe in the flow of philosophical information. Epicureanism is like the Museo del Prado in Madrid and Marx got inspired by visiting the paintings of the old masters to draw his own picture.
Marxists present(ed) Epicurean philosophy as an incomplete building, but often as a fine one. I had a look on a old book about the central teachings of Marxism-Leninism. Before the author started his critique he only had the honest words on Epicurus.