A fake progressive.
A politician, pundit or other political player that pretends to be progressive while actually supporting unprogressive/corporatist policies.
Barack Obama is a fauxgressive. He pretends to be progressive in his campaigning, but he rarely fights for progressive causes and consistently supports corporatist, unprogressive policies.
Someone who hates President Barack Obama and pretends to be a progressive to make the hatred look like it's coming from within the Democratic Party.
Sally has voted Republican for 30 years, but she calls herself a "progressive" now to make it seem like the Democratic Party is splintering. She's a fauxgressive.