[1] During the 1904 presidential campaign, Boston millionaire Thomas W. Lawson charged that McCarren, a prominent support of Democratic candidate Alton B. Parker, was on the payroll of Standard Oil at the rate of twenty thousand dollars a year.

Lawson offered Senator McCarren $100,000 (equivalent to $3.4 million today) if he would disprove the charge.

One paper even referred to McCarren as "the Standard Oil serpent of Brooklyn politics.

[4] Patrick McCarren owned and raced Thoroughbred horses.

[5] He died on October 23, 1909, in St. Catherine's Hospital, in Williamsburg, Brooklyn.