Abraham Lincoln, remembered 150 years after a “decisive” battle of the U.S. Civil War, could have excelled in modern-day Washington politics, one of the pre-eminent scholars on the American president says.

“He would be tech savvy, he would lose the beard, he would have some cosmetic surgery, he would make an asset of his height,” historian Harold Holzer said in an interview for Bloomberg Television’s “Political Capital with Al Hunt” airing this weekend. “He was so smart about working with the press, getting the press to work in his behalf, giving out exclusives, and he would have mastered any medium.”

As one measure of Lincoln’s political prowess, Holzer recited an often-told tale of Lincoln thinking twice before dispatching a letter upbraiding his general who defeated the enemy at the Battle of Gettysburg, a turning point for the Northern victory in the Civil War. It was a precursor to the dilemma of hitting the send button on a regrettable e-mail....