[74] Thus, he quietly allowed his supporters to lobby for him, with the understanding that his name would not be entered at the convention unless it was clear none of the front-runners could win. To broaden his potential base of southern support as the convention approached, he wrote letters reiterating his support for the Compromise of 1850, including the controversial Fugitive Slave Act.[74][75]
The convention assembled on June 1 in Baltimore, and the deadlock occurred as expected. On the first ballot of the 288 delegates, held on June 3, Cass claimed 116, Buchanan 93, and the rest were scattered, without a single vote for Pierce. The next 34 ballots passed with no winner even close, and still no votes for Pierce. The Buchanan team then had their delegates vote for minor candidates, including Pierce, to demonstrate Buchanan's inevitability, and unite the convention behind him. This novel tactic backfired after several ballots as Virginia, New Hampshire, and Maine switched to Pierce; the remaining Buchanan forces began to break for Marcy, and Pierce was soon in third place. 