Question:  Alejandro "Alex" Castellanos worked on electoral campaigns for Republican candidates including one who was the Republican presidential nominee in what year? 
Sentence (from "Bob Dole"): Robert Joseph Dole (born July 22, 1923) is an American lawyer and politician who represented Kansas in Congress from 1961 to 1996 and served as the Republican Leader of the United States Senate from 1985 until 1996.
Relevant evidence: Yes