It's a matter of fact, not courtesy. But thanks, anyway.
Certain "progressives" wanted tariff reform (Cummins, La Follette, Beveridge, etc.), but they were insincere in it, and wanted it as a matter of fighting the Old Guard and little more. Come 1912, they put their collective reformer tails between their legs and sucked up to the great TR, who understood that the only substantial difference between him and Wilson was on the tariff. Like I said, for Roosevelt, the tariff was all politics.
Mainstream historians ignore the tariff becuase they see no value in it from their own little perspectives. It means nothing to the qualities they wish upon Wilson, TR, and the progressives. Despite their ignorance, the tariff was the largest issue of the election of 1912.