Lierman, the daughter of Democratic stalwart Terry Lierman, had worked on the presidential runs of John F. Kerry and Howard Dean but had never run for office.

"I've had such incredible support from so many friends, old and new," said Lierman. "It's just been an amazing experience."

In East Baltimore's District 45, where McFadden led Henson, newcomer Democrat Cory McCray appeared likely to join Dels. Talmadge Branch and Cheryl Glenn.

In Baltimore County, if Brochin survives a challenge from the left, he'll face a challenge from the right: Republican doctor Tim Robinson.

Republicans Del. Susan L. Aumann and Chris West led a race to advance to the general election in District 42B.

The county's delegation also could see newcomers in office on both its western and eastern sides. New delegates are expected to win primaries in the Catonsville and Dundalk areas after incumbents left office. Democrats Eric Bromwell, Bill Paulshock and Renee Smith Bhandari led in District 8, while Democrats Del. Adrienne A. Jones, Jay Jalisi and Benjamin Brooks led in District 10.

Incumbent Democratic Dels. Dan Morhaim and Dana M. Stein and newcomer Shelly Hettleman led in District 11, while Democrats Eric Ebersole, Clarence K. Lam and Terri L. Hill were ahead in the race to advance in District 12.

In nearby District 44, Democrats Charles E. Sydnor III, Aaron J. Barnett and Pat Young led the race advance to the general election.

In Howard County, early results favored small business owner Ryan Frederic to run against Republican Del. Gail Bates for Senate in the western part of the county. Republicans Del. Warren E. Miller and Trent Kittleman led challengers in 9A, while Republican Bob Flanagan and Democrat Tom Coale led in early results for District 9B.

Democratic Dels. Shane Pendergrass and Frank Turner and attorney Vanessa Atterbeary were ahead in early results in District 13.

Baltimore Sun reporters Matt Bracken and Will Fesperman contributed to this article.