SANTA MARIA, Calif. (Reuters) - The judge in the Michael Jackson molestation trial on Thursday barred prosecutors from calling an expert on domestic violence they hoped would explain the apparently erratic behavior of the accuser's mother for jurors. Judge Rodney Melville also said he would allow evidence showing that Jackson's then-13-year-old accuser and younger brother had masturbated while looking at the pop star's pornography, potentially bolstering defense claims that the boys had run wild at Neverland. Both rulings were setbacks for the prosecution, which is in the final stages of presenting its case to the jury of eight women and...