+9 Franklin Roosevelt (1934)
+8 George W. Bush (2002)
-4 John F. Kennedy (1962)
-8 George H.W. Bush (1990)
-9 Calvin Coolidge (1926)
-12 Richard Nixon (1970)
-15 Jimmy Carter (1978)
-18 Dwight D. Eisenhower (1954)
-26 Ronald Reagan (1982)
-27 Donald Trump (2018)
-32.4 --AVERAGE--
-47 Lyndon B. Johnson (1966)
-48 Gerald Ford (1974)
-52 Herbert Hoover (1930)
-54 Bill Clinton (1994)
-54 Harry S. Truman (1946)
-56 William Howard Taft (1910)
-63 Barack Obama (2010)
-63 Woodrow Wilson (1914)
-77 Warren G. Harding (1922)
Senate
+9 Franklin Roosevelt (1934)
+4 John F. Kennedy (1962)
+3 Donald Trump (2018)
+3 Woodrow Wilson (1914)
+2 Richard Nixon (1970)
+1 George W. Bush (2002)
0 Ronald Reagan (1982)
-1 George H.W. Bush (1990)
-1.7 --AVERAGE--
-2 Dwight D. Eisenhower (1954)
-3 Lyndon B. Johnson (1966)
-4 Gerald Ford (1974)
-6 Calvin Coolidge (1926)
-6 Herbert Hoover (1930)
-6 Barack Obama (2010)
-7 Warren G. Harding (1922)
-9 Bill Clinton (1994)
-9 William Howard Taft (1910)
-10 Harry S. Truman (1946)
Notes
1. Warren G. Harding, John F. Kennedy and Gerald Ford did not serve a full term, but all three were in office during mid-term elections.
2. Calvin Coolidge's first full term is defined as 1925-1929 since he assumed the office after the 1922 mid-term elections.
3. Harry S. Truman's first term is defined as 1945-1949 since he assumed the office before the 1946 mid-term elections.
4. Lyndon B. Johnson's first full term is defined as 1965-1969 since he assumed the office after the 1962 mid-term elections.