After completing his apprenticeship at age 21, Berry relocated to
Bristol, New Hampshire, where he purchased a tannery. In the 1820s and 1830s Berry was active in the
New Hampshire Militia. He received a commission as a
second lieutenant in the 34th Regiment, and advanced through the ranks to become regimental commander with the rank of
colonel. Berry later relocated to
Hebron, New Hampshire, where he continued to operate a successful leather goods business until it was destroyed in an 1857 fire. A
Democrat, Berry served in the
New Hampshire House of Representatives in 1828, 1833, and 1834. He served in the
New Hampshire State Senate in 1835 and 1836. Berry was also a delegate to the
1840 Democratic National Convention. Unhappy with the Democratic Party's support for slavery, and also interested in other reform movements including
temperance, Berry became involved in the movement which led to the creation of the
Free Soil Party. He ran unsuccessfully for Governor as a Free Soil Democratic candidate in every annual election from 1846 to 1850, enabling the election of
Whig nominee
Anthony Colby by splitting the Democratic vote in 1846. In some elections Berry's candidacy prevented the "regular" Democratic nominee from receiving the majority of the popular vote required by New Hampshire's constitution, and the state legislature had to choose the winner. Berry served as a
Judge of the
Grafton County Court of Common Pleas from June 1841 to June 1850. He was a Judge of Grafton County's Probate Court from 1856 to 1861. He became a
Republican when the party was created in the mid-1850s. ==Governorship==