Sen. Bernie Sanders is taking the high road after Hillary Clinton complained about the damage to her presidential bid inflicted by Sanders's own campaign in her forthcoming book. It's just that the road is covered in shade.

Appearing on CBS's “Late Show” with Stephen Colbert on Thursday, the senator from Vermont didn't say that the former Democratic nominee has only herself to blame for her loss to Donald Trump — or anything so directly confrontational. In fact, Sanders said he understands why Clinton would resent him for a tough (and long) primary fight.

Rather than concede some merit to Clinton's gripe, however, Sanders suggested that his former rival is simply venting her emotions.