Elizabeth Warren is a progressive hero, so it’s notable when she takes a position that is attacked on the left. A case in point is Venezuela, where the Senator has more or less supported Donald Trump’s policy. In a podcast clip from earlier this year that’s getting second life on the left, Ms. Warren calls Venezuela’s Nicolás Maduro “obviously a dictator” who’s putting people through “a nightmare.”

She argues for humanitarian aid and criticizes Mr. Trump for “saber rattling.” But she also advocates a strong response, including...