Palin fires shot at Romney at Bunker Hill By NBC's Shawna Thomas, Alex Moe, and Mark Murray In remarks made at Bunker Hill in Massachusetts -- of all places -- Sarah Palin fired a shot at Mitt Romney over the health-care mandate that Romney signed into law in the state in 2006.The remarks came just before Romney formally announces his presidential bid in nearby New Hampshire, which Palin also plans to visit later today."In my opinion, any mandate coming from government is not a good thing, so obviously ... there will be more the explanation coming from former governor, Romney,...