Radley Balko makes the case that Coakley is "far to the right" of Kennedy on criminal justice:
The Melendez-Diaz case wasn’t an anomaly. Coakley has made her reputation as a law-and-order prosecutor. More troubling, she’s shown a tendency to aggressively push the limits of the law in high-profile cases and an unwillingness to cop to mistakes be they her own or those of other prosecutors. Coakley’s most recent high-profile case was the “Aqua Teen Hunger Force” hoax, in which she defended Boston authorities’ massive overreaction to harmless light-emitting-diode devices left around the city as a promotional gimmick.
More on the 2007 "bomb scare" from Wiki:
The LEDs were arranged to show a cartoon character displaying the middle finger. Two variants were manufactured with the LEDs arranged in pixelated likenesses of Ignignokt and Err, Mooninite characters from Aqua Teen Hunger Force. Massachusetts Attorney General Martha Coakley said the device "had a very sinister appearance. It had a battery behind it, and wires." Others compared the displays to the Lite-Brite electric toy in appearance.