Vox | Features research by Alexander Hertel-Fernandez, Ph.D. candidate in Government & Social Policy, and Theda Skocpol, Victor S. Thomas Professor of Government & Social Policy, from their paper "Billionaires against Big Business: Growing Tensions in the Republican Party Coalition."
Also cites Skocpol and Vanessa Williamson (Ph.D. '15, now a fellow at the Brookings Institution), The Tea Party and the Remaking of Republican Conservatism.