NORTHAMPTON, Mass. (AP) — Republican State Rep. David Humason (HOO'-mah-son) Jr. and Democratic City Councilor David Bartley of Holyoke will face off in the Nov. 5 election to succeed longtime western Massachusetts state Sen. Michael Knapik (kuh-NAP'-ik).

Bartley defeated Easthampton Mayor Michael Tautznik (TOTZ'-nik) in Tuesday's preliminary election in the 2nd Hampden-Hampshire District.

Humason defeated Michael Franco, Holyoke veterans' services officer.

Knapik, a Republican, served 22 years in the Legislature. He stepped down in August to become Westfield State University's executive director of university advancement.

Bartley is the son of former Massachusetts House Speaker David M. Bartley.

A victory by Bartley would leave just three Republicans in the 40-member Senate.