By tradition, when does the presidential campaign begin?

Question

A. When a candidate is officially nominated at the national convention
B. After a candidate has gained enough electoral votes in the primaries
C. In September, following the national convention
D. With the New Hampshire primary

Answer 1

Actually it's answer E. as soon as you elect them for Senator....

Answer 2

E. The month after the current president is sworn into office.

Any of the above could also be correct answers, for individuals.