Can anyone help me with this one? Title, lyric, origin? What I can recall is shown below. Thanks...Tiger

The old man sat in the grandstand chair, Hay in his whiskers, hay in his hair, And his voice rang out through the frosty air, I'm bettin' the roll on Roamer.

He was sired by Zev down in Arkansas, His mother was a cousin of Man O'War, And he won every race that he started for, I'm bettin' the roll on Roamer.