MADISON, Wis. — In this week’s Marquette Law School poll, 48 percent of respondents said Madison millionaire Mary Burke, the Democrat’s candidate for governor, has not been clear enough about what she would do if elected. Now it turns out Burke’s signature jobs plan, the one area in which she seemed clear about her intentions, was lifted from others. Buzzfeed, which has had its own PR black eyes with plagiarism, reported late Thursday that Burke’s plan, “Invest for Success” pilfers entire passages from the jobs plans laid out by Delaware Democratic Gov. Jack Markell in 2008, and Democratic gubernatorial candidates...