Question:  Alejandro "Alex" Castellanos worked on electoral campaigns for Republican candidates including one who was the Republican presidential nominee in what year? 

Context articles: American Freedom Campaign
Bob Dole
Alex Castellanos
United States presidential election, 1948
Thomas E. Dewey
Montana gubernatorial election, 1980
Electoral history of Ron Paul
Marco Rubio presidential campaign, 2016
Politics of San Diego County
American Bridge 21st Century

The American Freedom Campaign is an organization that has as its goal to put restoration of the Constitution on the agenda for Democratic presidential candidates, roughly parallel to the goal of the American Freedom Agenda for Republican candidates, although Democratic and Republican candidates could sign on to both pledges.
 It was launched in July 2007 by the Center for Constitutional Rights, Human Rights Watch and MoveOn.
 
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.
 He was the Republican presidential nominee in the 1996 presidential election and the party's vice presidential nominee in the 1976 presidential election.
Alejandro "Alex" Castellanos (born 1954) is a Cuban American political consultant.
 He has worked on electoral campaigns for Republican candidates including Bob Dole, George W. Bush, Jeb Bush, and Mitt Romney.
 In 2008, Castellanos, a partner at National Media Inc., co-founded Purple Strategies, a bipartisan communications firm.
 Castellanos is also a regular guest commentator on "Meet the Press" and a contributor for CNN.
The United States presidential election of 1948 was the 41st quadrennial presidential election, held on Tuesday, November 2, 1948.
 Incumbent President Harry S. Truman, the Democratic nominee, who had succeeded to the presidency after the death of President Franklin D. Roosevelt in 1945, successfully ran for election for a full term against Thomas E. Dewey, the Republican nominee, who also was the Republican presidential nominee in 1944.
Thomas Edmund Dewey (March 24, 1902 – March 16, 1971) was an American lawyer, prosecutor, and politician.
 He served as the 47th Governor of New York from 1943 to 1954.
 In 1944, he was the Republican Party's nominee for President.
 He lost the 1944 election to President Franklin D. Roosevelt in the closest of Roosevelt's four presidential elections.
 He was again the Republican presidential nominee in 1948, but lost to President Harry S. Truman in one of the greatest upsets in presidential election history.
 Dewey played a large role in winning the Republican presidential nomination for Dwight D. Eisenhower in 1952, and helped Eisenhower win the presidential election that year.
 He also played a large part in the choice of Richard M. Nixon as the Republican vice-presidential nominee in 1952 and 1956.
The 1980 Montana gubernatorial election took place on November 4, 1980.
 Incumbent Governor of Montana Thomas Lee Judge, who was first elected in 1972 and was re-elected in 1976, ran for re-election.
 However, he faced a stiff challenge in the Democratic primary from his lieutenant governor, Ted Schwinden, and he ultimately lost renomination.
 Schwinden, advancing to the general election, faced Jack Ramirez, the Minority Leader of the Montana House of Representatives and the Republican nominee.
 Despite the fact that Ronald Reagan, the Republican presidential nominee, won the state in a landslide that year, Schwinden managed to comfortably defeat Ramirez to win his first of two terms as governor.
Electoral history of Ron Paul, Republican U.S. Representative from Texas (1976-1977, 1979-1985, 1997-2013), 1988 Libertarian Party Presidential nominee and candidate for the 2008 and 2012 Republican presidential nomination.
The 2016 presidential campaign of Marco Rubio, the junior United States Senator from Florida, and former Speaker of the Florida House of Representatives, was formally announced on April 13, 2015, at an event at the Freedom Tower in Downtown Miami.
 Early polling showed Rubio, who was considered a potential candidate for Vice President by Republican presidential nominee Mitt Romney in 2012, as a frontrunner candidate for the Republican nomination for President of the United States in 2016 since at least the end of the 2012 election.
 Rubio was the second Cuban American to run for President of the United States, declaring approximately three weeks after fellow Republican Ted Cruz.
 He suspended his campaign on March 15, 2016, after finishing second in the primary for Florida, his home state.
 Turning 45 in 2016, Rubio would've been the third youngest president to take office, the others being Theodore Roosevelt and John F. Kennedy, who took office at ages 42 and 43 respectively.
 Rubio would've also been the first president of Latin American culture, as he was born to Cuban parents, as well as the first Florida native to become president.
San Diego County has historically been a Republican stronghold.
 The Republican presidential nominee carried the county in every presidential election from 1948 through 2004, except in 1992 when Bill Clinton won a plurality.
 In 2008, Barack Obama became the first Democratic presidential candidate to win a majority of votes in San Diego County since World War II; he won a majority of county votes again in 2012.
American Bridge 21st Century is a liberal American Super PAC that supports Democratic candidates and opposes Republican candidates.
 It was founded by David Brock in 2010 and is associated with Media Matters for America.
 It is an opposition research hub for the Democratic Party.
 The group physically tracks and monitors Republican candidates and officials and uses social media to deploy its findings.