The fact is that Al Gore continued to grow tobacco and courted the tobacco farmers' support during the 1988 presidential primaries, long after his sister had died.
In the 1988 campaign, Gore bragged of his tobacco background: “I want you to know that with my own hands, all of my life, I put [tobacco] in the plant beds and transferred it. I’ve hoed it, I’ve dug in it, I’ve sprayed it, I’ve chopped it, I’ve shredded it, spiked it, put it in the barn, and stripped it and sold it” (Newsday, 2-26-88).
Here's another source of Al Gore's habitual Barbra Streisand.
Of course, it could be the company he keeps.