Whites in this nation were scared of Kennedy because he might be influenced by the Catholic Church and have to answer to the Pope. Kennedy had to address this in his campaign because, at his time - and now too among the more rabid - southern baptists and others of their ilk were sure that the Catholic Church was the Whore of Babylon from the book of Revelations. Not only that, Catholics could drink and dance without going to hell, according to their doctrine. Kennedy was painted as a scary man who threatened white protestant America... endangered it because of his "radical" religious background.
(Those extremist views of catholicism, on the other hand, weren't radical at all... and, no, they weren't. They were standard hateful views by southern protestanism.)
Of course, Kennedy was not in any way beholden to the Catholic Church or the Pope. Kennedy's campaign message was a call for the Democratic Party of FDR.
From the Kennedy Library
http://www.jfklibrary.org/Historical+Resources/JFK+in+History/Campaign+of+1960.htm
John Fitzgerald Kennedy captured the Democratic nomination by winning a series of state primaries despite his youth (he was only 43), charges by his opponents that he lacked experience in foreign affairs, and his Catholic faith. He had to overcome the traditional assumption that a winning candidate must have the support of entrenched party leaders from states with large blocs of electoral votes. A solid victory in overwhelmingly Protestant West Virginia launched him toward a first ballot victory at the Democratic Convention in Los Angeles--although he did not reach the 761 votes required for the nomination until the final state in the roll call (Wyoming). MLK was feared in the south among whites who thought he was radical for proclaiming equal rights and for noting establishment America's continued failure to honor the Constitution's reason for being: the dedication to equality under the law. MLK was trying to go "too fast." Whites weren't ready for full black equality under the law (this was, in fact, an argument of the time, more or less.) Yet -
When Martin Luther King, Jr. was arrested in Georgia for leading civil rights protests, Kennedy, against the advice of several key campaign strategists, called Mrs. King on October 26 to offer help in securing her husband's safe release. Kennedy was subsequently endorsed by the Rev. Martin Luther King, Sr., father of the civil rights leader. The black vote went heavily for Kennedy across the nation, providing the winning margin in several major states.Kennedy provided hope to Americans who were hiding under desks during atomic bomb drills. He offered a vision of America that works for all, not just the captains of a gilded age.
Kennedy tried to identify himself with the liberal reform tradition of the Democratic party of Franklin Roosevelt and Harry Truman, promising a new surge of legislative innovation in the 1960s. JFK hoped to pull together key elements of the Roosevelt coalition of the 1930s (urban minorities, ethnic voting blocs and organized labor), to win back the conservative Catholics who had deserted the Democrats to vote for Eisenhower in 1952 and 1956, and to at least hold his own in the pre-civil rights movement's "Solid South."(this reminds me of Dean's strategy, rather than the DLC's. )
Using Kennedy's "scary Catholicism" was a political hack's tool. Just like using the Rev. Wright is a political hack's tool. The Catholic church isn't an institution whose ideas I love and embrace. Neither is Wright, in some of his opinions. Neither is Bob Jones University. Neither is the Southern Baptist Convention. All hold opinions that would be considered radical and extremist.
Obama, like Kennedy, is a liberal who wants to change the destructive course of this nation. Those who prefer the status quo will fight to stop this. That's politics. Those democrats who try to paint Obama as the new "scary catholic whore of babylon" are no better than the race baiters and haters in 1960s America.