sunday roundup week donald trump cross delegate threshold need secure republican nomination nation cross danger threshold elect  USA able unready extreme president  USA  history worry say paul manafort interview huffpost howard fineman trump campaign manager assure trump america fill chair ban muslims start moderate manafort say operate start conversation outer edge bring middle comfort zone soften problem soften racism xenophobia misogyny dangerous medium retreat horserace coverage will trump sheila foster anthony sister late vince foster speak trump airing conspiracy theory brother death contempt write politician use family tragedy candidacy trump live america comfort zone