“ In 1863 he again took his seat in the United States Senate. In 1868 he was appointed minister to Great Britain and soon after his arrival in England negotiated the Johnson-Clarendon treaty for the settlement of disputes arising out of the Civil War ”

“ In 1856 he became identified with the conservative wing of the Democratic party, and four years later supported Stephen A. Douglas for the presidency. In 1861 he was a delegate from Maryland to the peace convention at Washington; in 1861–1862 he was a member of the Maryland House of Delegates. After the capture of New Orleans he was commissioned by Lincoln to revise the decisions of the military commandant, General B. F. Butler, in regard to foreign governments, and reversed all those decisions to the entire satisfaction of the administration. ”