WSJ:

Few courts have considered the types of requests being made by the Trump campaign, such as keeping a state from certifying its election based on allegations that Republican poll observers lacked sufficient access to ballot counting.

President Trump’s lawyers in federal court this week asked a judge to take that unprecedented step, arguing that Pennsylvania had inadequate safeguards to detect voting fraud. The campaign is pursuing similar claims in Michigan, where Republicans also are alleging misconduct in the election process.

But such relief has rarely, if ever, been awarded to a campaign running behind in an election.

“I don’t think there’s any precedent for this,” said Daniel Tokaji, an election-law expert and dean of University of Wisconsin Law School, referring to the Pennsylvania case. “The lawsuit is a Hail Mary pass.”

The Trump campaign’s suit in Pennsylvania alleges counties controlled by Democrats processed ballots in unmonitored back rooms or in larger barricaded spaces with poll observers kept at a distance.

State election officials have said they followed all laws and have declined to comment on the litigation. Republicans haven’t offered evidence of fraud in Pennsylvania.