TPM Reader JS points us to this definition of 'blind trust' at investopedia.com ...

A trust in which the executors have full discretion over the assets, and the trust beneficiaries have no knowledge of the holdings of the trust ... Blind trusts are generally used when a trustor wishes to keep the beneficiary unaware of the specific assets in the trust, such as to avoid conflict of interest between the beneficiary and the investments.

Guess that mean some unnamed Senate Majority Leader didn't really have a blind trust?