Mary Todd Lincoln participated in political life through her partnership with Abraham Lincoln and the public responsibilities of the White House. In Springfield she followed political debate, cultivated connections, and supported her husband's ambitions while managing a household frequently affected by his legal travel. Her education and political interests informed her advice, although she held no government office.

As first lady from 1861 to 1865, she worked to present the presidential household as a symbol of national authority during the Civil War. She organized receptions and undertook extensive refurbishment of the White House. The cost of this work and her purchases brought criticism, especially amid wartime sacrifice. Her Kentucky origins and relatives serving the Confederacy also generated suspicions of disloyalty, despite her own commitment to the Union.

Lincoln visited wounded soldiers, brought gifts to hospitals, and supported charitable relief. Her relationship with the dressmaker and formerly enslaved businesswoman Elizabeth Keckly connected the presidential household with Black Washington and relief efforts. Private grief repeatedly interrupted her public duties: her son Willie died in 1862, and she was beside the president when he was shot at Ford's Theatre in April 1865. These losses profoundly shaped the years that followed.

As a widow she struggled with finances, bereavement, public scrutiny, and efforts to obtain adequate support from Congress. She spent periods in Europe, and Tad's death in 1871 brought another major loss. In 1875 her son Robert initiated proceedings that resulted in her commitment to a private institution. She enlisted lawyers and supporters, secured release within months, and later regained legal control of her affairs. The episode remains contested and does not support a confident modern diagnosis from a distance. Her record combines political engagement, wartime service, and a struggle for autonomy as a widow.