The junior senator from the Ocean State made some changes to his stock portfolio in May. On May 8 and May 10, U.S. Sen. Sheldon Whitehouse (D-RI), sold shares of Diageo (DEO -1.50%) and bought shares of Crown Castle (CCI 0.16%), respectively, according to June 6 filings. Although it's unclear how many shares were involved in the trades, the amount reported for the Diageo transaction was between $15,001 and$50,000, while the Crown Castle transaction was between $1,001 and$15,000. Since May 8 through the cl ...