Tom Steyer's open letter to anti-Keystone lawmakers

Tom Steyer is vowing to throw his political weight and money behind any lawmaker in Congress who comes under attack for opposing the Keystone XL pipeline.

The billionaire hedge-fund-manager-turned-environmental-activist penned an open letter on Thursday, pledging to utilize his primarily self-funded super PAC, NextGen Climate Action, to back members of Congress that face attack from pro-Keystone groups heading into the midterm elections.

Tom Steyer's open letter to aid anti-Keystone lawmakers

Read more from The Hill:

Steyer goes to bat for anti-Keystone Dems under attack