Brazil's Rousseff pledges unity gov't as momentum for impeachment grows

By Anthony Boadle and Maria Carolina Marcello BRASILIA (Reuters) - Brazil's President Dilma Rousseff pledged on Wednesday to form a government of national unity if she survives an impeachment vote in Congress this weekend, but the odds against her lengthened as even remaining allies wavered in their support. Rousseff is scrambling to shore up votes against impeachment as a stream of defections from her coalition make it increasingly likely she will lose Sunday’s ballot in the lower house o