make capital out of
Use profitably, turn to account, as in The challengers made capital out of the President's signing a bill that increased taxes. This expression, first recorded in 1855, uses capital in the sense of “material wealth used to create more wealth.”
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.