Of all of the major party platforms in 1912, only the Republican platform directly addressed lynching. Even then, it did so in general terms and associated lynching with lesser categories of malfeasance.
The Republican platform section on "Civic Duty" read as follows:
We call upon the people to quicken their interest in public affairs, to condemn and punish lynchings and other forms of lawlessness, and to strengthen in all possible ways a respect for law and the observance of it. Indifferent citizenship is an evil against which the law affords no adequate protection and for which legislation can provide no remedy.