State Rep. Sara Innamorato led a progressive clean sweep Tuesday in Democratic primary elections for Allegheny County offices, winning the party’s nomination for county executive to extend a series of victories over establishment-friendly Democrats in Western Pennsylvania.

Robust support in Pittsburgh helped lift Ms. Innamorato, 37, a progressive from Lawrenceville, over City Controller Michael Lamb and County Treasurer John Weinstein. With almost all the votes counted Tuesday night, Ms. Innamorato had almost 38%, compared to about 30% for Mr. Weinstein and about 20% for Mr. Lamb.

She will face former PNC executive Joe Rockey in the general election, after Mr. Rockey was the only Republican candidate to run in the primary. If she wins in November, she would be the first woman to hold the executive position since voters created the job — part of a county government overhaul approved in 1998. One Republican and two Democrats have been the county executive since the new government structure took effect in 2000.

- snip -

In Democratic-leaning Allegheny County, the primary win makes Ms. Innamorato the early front-runner to succeed Rich Fitzgerald, the term-limited Democrat who has been county executive since 2012. Progressive candidates for county-wide offices appeared to run the table Tuesday, with challenger Matt Dugan, incumbent Bethany Hallam and newcomer Erica Rocchi Brusselars leading Democratic primaries for district attorney, an at-large County Council seat, and county treasurer, respectively.