The phrase "fellow progressives" refers to people who have similar political beliefs and ideas as yourself. They are individuals who share your progressive values and goals. Full definition
And then today Harman went on the attack, thanking a Tory prime minister for listening to his magistrate mother rather than the policies of fellow progressives Lib Dems. (politics.co.uk)
Zephyr Teachout and Tim Wu urge fellow progressives to «be courageous» and challenge Democratic elected officials «who have abandoned their constituents.» (nystateofpolitics.com)