National Public Radio: President Obama travels to Holland, Mich., to attend the groundbreaking for a factory that will make batteries for electric cars. The $300 million factory is one of nine battery plants the government is helping to fund with its economic stimulus program. Obama often talks about these plants as engines for a new, clean-energy economy. But the plants have been slow to jump-start the nation’s sputtering job market. Well before Thursday’s ceremonial groundbreaking, construction …