James K. Polk: The 11th President 1845-1849 (The American President Series)

In the summer of 1844, James K. Polk's political career was in ruins. As the Democratic National Convention approached, Polk had thought himself assured of the vice presidential nomination, but the presidential front-runner, former president Martin Van Buren, had made it clear that he had little interest in him. Van Buren was on a mission to regain the White House, which he had lost in 1840, and he needed a strong running mate. Polk had three strikes against him. First, Polk had been unable to deliver his and Andrew Jackson's home state of Tennessee in 1840, while Polk was governor. Second, he was fresh from having lost the governor's mansion - for a second time. And third, Van Buren - as well as the Whigs' candidate, Henry Clay - had just taken a stand against the annexation of Texas, whereas Polk had come out in its favor. But as the delegates assembled in Baltimore, Polk perceived a wave of public sentiment in favor of bringing Texas into the Union, and he rode that wave all the way to the nomination and eventually the White House - the first "dark horse" candidate to do so.