The name of David Darby's attorney, Stephen Pidgeon, may seem familiar.
Pidgeon also represents a group that is challenging a state law that invalidated some signatures on a petition to force a vote on Clark County light rail.
The cases' common thread hinges on constitutional arguments.
The 75 plaintiffs in the light-rail case contend that the law regarding municipal petitions, which reads, "Signatures, including the original, of any person who has signed a petition two or more times shall be stricken," is unconstitutional.
They argue that the law doesn't match restrictions on other types of petitions, such as statewide petitions, in which the original signature can be counted.
Clark County Auditor Greg Kimsey, who is a defendant in the case, invalidated all of the signatures of people who signed multiple times. He has said that although he personally disagrees with the law, he was obligated to follow it.
The plaintiffs want a judge to order Kimsey to count the original signatures of people who signed the petition more than once.
The group, which spent more than two years collecting the signatures, was 32 names short of the 5,472-signature requirement to secure a spot on the ballot.
If the petition had succeeded, the Vancouver City Council would have asked voters to decide on a proposed ordinance that would have prohibited any city resources from being used to extend TriMet's MAX line from Portland to Vancouver as part of the Columbia River Crossing project.
The light-rail case is being heard in Cowlitz County to avoid any conflict of interest. A hearing last week was extended until March 27.
Pidgeon, who made an unsuccessful bid for state attorney general in 2012, also is known for his challenge of Barack Obama's eligibility to be president.
He is author of "The Obama Error." In the 2011 book, Pidgeon alleges the president is not a natural-born U.S. citizen and has socialist, communist and Muslim ties.
--Paris Achen