In new 30-second TV spot set to air in Michigan, Pennsylvanian mocks Boston’s negative ad blitz and invokes Romneycare.

Announcer: “Romney’s trying to hide from his big-government Romneycare, and his support for job-killing cap-and-trade.”

Read the script below.

SCRIPT: “Mitt Romney’s negative attack machine is back, on full throttle. This time, Romney’s firing his mud at RICK SANTORUM. Romney and his super PAC have spent a staggering 20 million … attacking fellow Republicans. Why? Because Romney’s trying to hide from his big-government Romneycare, and his support for job-killing cap-and-trade. And in the end, Mitt Romney’s ugly attacks are going to backfire.”