The president continued to recognize the pro-slavery legislature, which was dominated by Democrats, even after a Congressional investigative committee found its election to have been illegitimate. He dispatched federal troops to break up a meeting of the Topeka government.[133][134]
Passage of the act coincided with the seizure of escaped slave Anthony Burns in Boston. Northerners rallied in support of Burns, but Pierce was determined to follow the Fugitive Slave Act to the letter, and dispatched federal troops to enforce Burns's return to his Virginia owner despite furious crowds.[135][136]
The midterm congressional elections of 1854 and 1855 were devastating to the Democrats (as well as to the Whig Party, which was on its last legs). The Democrats lost almost every state outside the South. The administration's opponents in the North worked together to return opposition members to Congress, though only a few northern Whigs gained election. In Pierce's New Hampshire, hitherto loyal to the Democratic Party, the Know-Nothings elected the governor, all three representatives, dominated the legislature, and returned John P. Hale to the Senate. Anti-immigrant fervor brought the Know-Nothings their highest numbers to that point, and some northerners were elected under the auspices of the new Republican Party.