Approaching the Election of 1848, President James Polk did not have unanimous support amongst Democrats. In fact, quite the opposite.
Throughout the first twelve days of November of 1844, the population voted for the next president. Voters had to pick between the Democrat, James Polk, the Whig, Henry Clay, and the Liberty Party’s candidate, James Birney. See Daniel Walker Howe, What Hath God Wrought: Transformation of America, 1815-1848, 688.