In a upset forecast by some, but still a shock to others, longtime Sen. Rich Colburn was defeated by Delegate Addie Eckardt in the state senatorial primary election Tuesday.

Eckardt, a veteran lawmaker, received 56.9 percent of the votes to Colburn’s 43 percent. She jumped into the race after problems in Colburn’s marriage publicly surfaced in a divorce filing.

The unofficials totals showed Eckardt receiving 6,104 votes to Colburn’s 4,626.

Eckardt’s legislative legacy began in 1995.

She will face Cambridge lawyer Chris Robinson, a Democrat, in the general election Nov. 4.

With Eckardt’s challenge of Colburn and Jeannie Haddaway’s decision to run for lieutenant governor -- a race she lost with ticket-topper David Craig on Tuesday -- District 37B was wide open and incumbent-free.

The district primarily covers Talbot, Dorchester and Caroline counties, but a portion dips down to encompass western and northern Wicomico.

For House of Delegates in 37B, Talbot restaurant owner Johnny Mautz had 35 percent of the vote. Salisbury businessman Chris Adams was second with 24 percent.

Rene Desmarais, a Salisbury cardiologist, had 19 percent of the vote.

Finishing out of contention were Allen Nelson, a retired businessman, with 9 percent and Mid-Shore accountant Karen Tolley with 11 percent.

Rodney Benjamin and Keasha Haythe had a clear path on the Democratic side of the 37B ballot, so Mautz, Adams, Benjamin and Haythe will face off for two spots.

In the newly created District 38C, Democrat Judy Davis was the champion, beating fellow party member Mike Hindi to set up a fall battle with Republican Mary Beth Carozza. Davis had 82 percent to Hindi’s 18 percent.