After months of giving ambiguous signals on abortion, Rudolph W. Giuliani is planning to offer a forthright affirmation of his support for abortion rights in public forums, television appearances and interviews in the coming days, despite potential consequences among some conservative voters already wary of his views, aides said yesterday. At the same time, Mr. Giuliani’s campaign — seeking to accomplish the unusual task of persuading the Republican Party to nominate an abortion rights supporter as its presidential candidate — is eyeing a path to the nomination that would try to de-emphasize the early states in which abortion opponents wield...