"Another Obama administration nominee has tax troubles. This time, it's Ron Kirk, the president's choice to be U.S. trade representative. Kirk owes an estimated $10,000 in back taxes from earlier in the decade and has agreed to pay them, the Senate Finance Committee said Monday. The committee said the taxes arise from Kirk's handling of speaking fees he donated to a scholarship fund that he set up at his alma mater, and for his deduction of the full cost of season tickets to the Dallas Mavericks professional basketball team."
These weren't "mistakes". These were tax scams. Kirk set up a "scholarship fund" to avoid taxes on speaking fees. Kirk overstated the value of items donated to charity. Kirk failed to report "gifts" (tickets to basketball games) received when he was mayor of Dallas.
Another fine representative.