Definition: Given a document, generate a short title of the document. The title should convey the main idea/event/topic about which the document is being written. Note that URLs in the text have been replaced with [Link].
Input: Corbyn is so far left , he makes Bernie look like a third way pro-business moderate . 
The typical winning Democratic playbook is one of triangulation and moderation , but the radicalism of the regional Republicans creates a national opportunity for progressive leaders like Senators Elizabeth Warren or Bernie Sanders , both formerly derided as unviable .

Roy Moore Is Doing Bernie Sanders Progressives a Big Old Favor . 