Sheldon Mayer was with DC Comics from the days before Superman and Batman. He was an editor for Max Gaines' All-American Comics branch of the company known collectively as DC. He quit his editor job so he could draw Scribbly, a very funny, somewhat autobiographical view of himself as a boy cartoonist. In 1956 he created Sugar and Spike, for which he's mainly —and justifiably — known. Late in life Shelly Mayer did try other genres, including science fiction and horror. He wrote and drew "Dear Senator" for Unexpected #217 in 1981.
It's hard to tell if he was trying for a more serious style, because some of his cartoony side shows up, like the robot which looks more like something from the 1930s or '40s. But I like this fish-out-of-water story, anyway. Who can resist a story about Abraham Lincoln brought to the future?
I took the original art from Heritage Auctions. I love looking at original art, but if you don't you can scroll down to the printed version.