After the back and forth between the two campaigns over who lied about whom, WaPo weighs in:

The Sanders campaign is exaggerating the contributions that Clinton has received from the oil and gas industry. In the context of her overall campaign, the contributions are hardly significant. It’s especially misleading to count all of the funds raised by lobbyists with multiple clients as money “given” by the fossil-fuel industry.

These attacks are misleading and desperate. If Bernie can't win selling his vision, he should focus on his attacks on the GOP, not Hillary. But more than that, he should tell the truth. Lying on the campaign trail does not reflect progressive values.