President Barack Obama is casting Mitt Romney as a greedy, job-killing corporate titan with little concern for the working class in a new, multi-pronged effort that seeks to undercut the central rationale for his Republican rival’s candidacy: his business credentials.

At the center of the push — the president’s most forceful attempt yet to sully Romney before the November election — is a biting new TV ad airing Monday that recounts through interviews with former workers the restructuring, and ultimate demise, of a Kansas City, Mo., steel mill under the Republican’s private equity firm.

“They made as much money off of it as they could. And they closed it down,” says Joe Soptic, a steelworker for 30 years. Jack Cobb, who also worked in the industry for three decades, adds: “It was like a vampire. They came in and sucked the life out of us.”

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