Two Dorchester incumbents in the House of Representatives are seeking to stave off challenges to their seats today: Rep. Daniel Cullinane has two challengers as he seeks his second full term: Jovan Lacet, a Mattapan lawyer, and Carlotta Williams of Hyde Park who is making another run for the seat after losing to Cullinane in 2014.

In the 5th Suffolk District, Rep. Evandro Carvalho’s sole Democratic challenger is Melinda Stewart of Dorchester. Carvalho will likely face perennial candidate Althea Garrison, who is running as a Republican, in the November election.Sen. Linda Dorcena Forry in the First Suffolk District and state representatives Russell Holmes in the 6th Suffolk and Dan Hunt in the 13th Suffolk are all running unopposed.

Suffolk County Sheriff Steve Tompkins, who has held his post since his appointment by Gov. Deval Patrick in 2103, is facing newcomer Alexander Rhalimi.

The most hotly contested race today is the usually sleepy run for Suffolk County Register of Deeds, which oversee property transactions in Boston, Chelsea, Revere, and Winthrop. Eyeing the Register seat are, in ballot order: Pope’s Hill resident and West Roxbury realtor Douglas Bennett; Lower Mills resident and attorney Stephanie Everett, Roslindale paralegal Katherine Forde; Michael Mackan; former city councillor at-large Stephen Murphy; Paul Nutting Jr., a Savin Hill civic leader with years of land management experience; and South End attorney Jeffrey Michael Ross.