27. William Howard Taft (Republican-OH) (1909-13)
28. Theodore Roosevelt (Progressive-NY) (1913-21)
29. Charles Evans Hughes (Republican-NY) (1921-29)
30. Calvin Coolidge (Republican-MA) (1929-33)*
31. Frank O. Lowden (Republican-IL) (1933)
32. Franklin D. Roosevelt (Progressive-NY) (1933-45)*
33. Henry A. Wallace (Progressive-WI) (1945-49)
34. Thomas E. Dewey (Democratic-NY) (1949-57)
35. Earl Warren (Democratic-CA) (1957-61)
36. Pat Brown (Progressive-CA) (1961-63)**
37. Hubert Humphrey (Progressive-MN) (1963-69)
38. Nelson Rockefeller (Democratic-NY) (1969-77)
39. Henry M. Jackson (Progressive-WA) (1977-81)
40. Ronald Reagan (Democratic-CA) (1981)**
41. John Connally (Democratic-TX) (1981-89)
42. Gary Hart (Progressive-CO) (1989-91)***
43. Bill Bradley (Progressive-NJ) (1991-93)
44. Pete Wilson (Democratic-CA) (1993-01)
45. Russ Feingold (Progressive-WI) (2001-2009)
46. Rudy Giuliani (Democratic-NY) (2009-2017)
47. Marco Rubio (Democratic-FL) (2017-present)
* died in office
** assassinated
*** resigned
Going >50 years without the Presidency would usually destroy a political party.
I can see your point, but the Democrats have one way of guaranteed survival; the solid south. No way anyone there would vote for a Republican or the liberal alternative of the Progressives.
In the election of 1932, the Progressives finish in first, while the Democrats come in second, and the Republicans in third. The Republican Party begins to fracture under FDR's presidency, leading to the Democratic Party taking control of both houses in the late 30s (they would control the House from 1930 to 32, but it would then go to Progressive control).
After FDR, the Republicans just barely cling onto the nation as their only places of strength are the Great Plains,Vermont, and Maine. Meanwhile on the coasts , liberal-leaning Democrats switch to Progressive with FDR's presidency and conservative-leaning Republicans join the Democratic Party as a result of the GOP's nationwide decay.
So essentially, the Democrats' "big tent" politics and a later electoral shift keep them alive.
