Here and here, for contrast.
UPDATE: "Only 23 of 100 U.S. Senators saw the folly of allowing Bush/Cheney to invade Iraq. I am very proud to be one of the 23." From Chafee's Policy positions online, last of the list.
"He is the author of Against the Tide: How a Compliant Congress Empowered a Reckless President (2008)." From here.
He is adept in hitting Jeb and Hillary with one shot, regardless of whatever else he brings to the contest. A "Compliant Congress" vs one of 23 who stood apart saying, "Plowshares, we need plowshares. Let's make plowshares. Pruning hooks. From swords and spears."
Who arguably was "compliant" to "a Reckless President" - that way - about entering and occupying Iraq - when having a Senate vote? Someone has a list, I will bet. Chafee early on is emphasizing his absence from any such list. Like Rand Paul in that dimension.
