I wonder if Paul Findley was confused. In Carl Sandburg's The Prairie Years (p. 356 of volume I) it says, "At the mess table in Mrs. Spriggs's boarding-house, where Lincoln took his meals, he ate with four Pennsylvania congressmen, Patrick Thompson of Mississippi, Elisha Embree of Indiana, Joshua Giddings, and others." (here)
So I am wondering if Findley confused Patrick Thompson with Jacob Thompson?