BostonGlobe.com Political Headlines - September 4, 2014 September 04, 2014 Here are the top political headlines from BostonGlobe.com today: Presidential mushiness on ISIS attacks: President Obama has badly mismanaged the image of how he is dealing with the brutal extremist group. Joan Vennochi details the story. Democratic gubernatorial hopefuls turn up heat: With the primary in five days, the three candidates increased their urgency in a debate. Joshua Miller reports. Tricky race for John Tierney: Tuesday’s primary isn’t about the upstarts running to unseat Tierney, it is a referendum on Tierney himself. Yvonne Abraham details the latest. John Tierney, Seth Moulton continue to exchange salvos: The Sixth District Democratic foes have been issuing increasingly bitter attacks in ads. Michael Levenson reports. Fired firefighter is on John Tierney flier: Tierney’s flier shows him posing with a Salem firefighter who was accused of misappropriating funds meant for charities. Stephanie Ebbert details the story.