Highest percent in your state

[Erc]

New York:
1964, Johnson (D): 68.56%
1920, Harding (R): 64.56%
1956, Eisenhower (R): 61.19%
2000, Gore (D): 60.21%

2000 is the only non-landslide election in which New York cracked 60% for one candidate or the other.

The best showing for any candidate pre-1920 is McKinley's 57.6% in 1896, followed by favorite son Van Buren's 1836 showing of 54.6%.  (New York was a swing state extraordinaire way back in the day).