Presidents have different personalities, with some being very gregarious and outgoing, clearly extroverts: and others being more described as “loners”, who could be cordial in public, but did not like being around government leaders very much, and are clearly introverts.
In the first category, we would include
Theodore Roosevelt
Franklin D. Roosevelt
Harry Truman
John F. Kennedy
Lyndon B. Johnson
Gerald Ford
Ronald Reagan
Bill Clinton
George W. Bush
In the second category, we would include
William Howard Taft
Woodrow Wilson
Warren G. Harding
Calvin Coolidge
Herbert Hoover
Dwight D. Eisenhower
Richard Nixon
Jimmy Carter
George H. W. Bush
Barack Obama is a unique case, not really fitting into either category clearly, as he can tend to be very gregarious, but also has difficulty dealing with Congress, with one speculating that he has been scarred by the total obstructionism of the opposition. He tends to avoid “schmoozing”, although the feeling is that he is basically quite gregarious.
So putting Obama in a separate category, notice that 9 Presidents (5 Democrats, 4 Republicans) are considered gregarious, while 9 Presidents (7 Republicans, 2 Democrats) are considered more “loners”.
63 years we have had gregarious Presidents; 45 years we have had “loner” Presidents, and then we have the 8 years of Obama.
Notice that the gregarious Presidents have, as a group, a more positive image in history, than the “loner” Presidents, and they have more often been reelected!
Among remaining Presidential Candidates as of this date, the “gregarious” candidates would include Hillary Clinton, Donald Trump, Marco Rubio and John Kasich, while the more “loner” types would be Bernie Sanders, Ted Cruz, and Dr. Benjamin Carson.