A campaign office for presidential candidate Barack Obama was opened Saturday at 208 N. Highland Ave. in East Liberty.
Several hundred volunteers gathered at the office before fanning out to canvass door-to-door on behalf of the Illinois senator.
Pennsylvania's primary election is April 22.
The Obama campaign and the Hillary Clinton campaign have said they hope to persuade some of the state's independent voters to register as Democrats so they can vote in the primary.
The Obama campaign also conducted organizing events yesterday in Penn Hills, Wilkinsburg and in Washington, Butler, Beaver and Westmoreland counties.
