Causin was born in St. Mary's County, Maryland.
He served as a member of the Maryland House of Delegates in 1837 and again 1843, and was elected as a Whig to the Twenty-eighth Congress, serving from March 4, 1843, to March 3, 1845.
After his tenure in Congress, Causin moved to Annapolis, Maryland, and served as a delegate to the State constitutional convention.
He later moved to Chicago, Illinois, in 1858 and resumed the practice of law.
He died in Cairo, Illinois, and is interred in the City Cemetery (now Lincoln Park) of Chicago.