"The process of integrating early votes into the results of the in-person precinct caucuses, however, was plagued with errors and inconsistencies," the campaign's letter said.
"You simply cannot compare the victory of Bernie Sanders, whose kin was murdered in the Holocaust, to the Nazi defeat of France," Anand Giridharadas said.
The Vermont senator made political history Saturday with his Nevada caucuses victory, becoming the first candidate from either party to win the popular vote in all three early states.
The party says that card-game tiebreakers were introduced for its caucuses in 2008.
The billboard is the latest broadside in the vicious war of words between the two septuagenarian New York billionaires.
President Donald Trump told a rally crowd in Las Vegas that the foreperson of the jury in Roger Stone's trial was "jumping up and down" after Stone's verdict was announced. "She did terrible things and said terrible things," Trump said.
"I'm very confident that we will be able to carry out a successful caucus," Democratic National Committee Chairman Tom Perez said.
Coming after the absurdity of the Iowa caucus meltdown, the Nevada debate had the Democrats look incompetent and deeply divided. The big winner of the debate was Donald Trump.
A Flash Flood Watch means that flooding of washes, creeks and other drainage areas is possible within the watch area.
"I thought I would make this easy," said Massachusetts Senator Elizabeth Warren at a CNN Town Hall Thursday before she read from a release form she wrote that would free people from nondisclosure agreements they signed with former New York City Mayor Michael Bloomberg.
Sheldon Adelson, whose wealth is estimated at $39.2 billion, is one of the Republican Party's most prominent donors.
The billionaire former mayor of New York endured a torrid time on stage in Nevada, struggling to fend off attacks from his competitors.
"He is a threat because he's already dropped $400 million in this campaign," said the Massachusetts senator.
Protesters from the immigrant advocacy group RAICES Action interrupted former Vice President Joe Biden's closing remarks at Wednesday's Democratic debate in Nevada. "You deported three million people!" they cried.
Massachusetts Senator Elizabeth Warren's campaign said the first hour of Wednesday's Democratic debate resulted in the best hour of fundraising in the campaign's history.
Former New York Mayor Mike Bloomberg said the stop-and-frisk policy used by New York police during his tenure "got out of control" at the ninth Democratic debate in Nevada Wednesday. But former Vice President Joe Biden said Bloomberg continued the practice even after he was asked to stop.
Lester Holt, Chuck Todd, Hallie Jackson, Vanessa Hauc and Jon Ralston will moderate the debate in Las Vegas.
"Mayor Bloomberg is profoundly unvetted. Story after story has come out and the sheer volume of these stories is disturbing," a senior Biden campaign official said.
The debate will kick off at 9 p.m. Eastern time on February 19.
"I'm very confident that we will be able to carry out a successful caucus," Tom Perez insisted.
The senator from Vermont has seen an uptick in support from hispanic voters, with a plurality of 42 percent of the demographic backing his candidacy.
A secretive group released a flock of pigeons donning MAGA hats on Tuesday to coincide with the 2020 Democratic Debate and Trump's visit to Las Vegas. Animal rights groups say the stunt is "cruel" and "absurd."
"What you'll see is an attempt to cut him down because he is on the move," political consultant Hank Sheinkopf said.
"#WheresWarren" became a trending topic on social media Tuesday after a poll co-sponsored by NBC News did not offer Massachusetts Senator Elizabeth Warren as a choice on some survey questions.
The senator from Vermont also appears to be the clear frontrunner in Nevada, which will hold its statewide caucuses on Saturday.
A progressive polling firm found the Vermont senator had a huge lead among Hispanic likely caucus-goers in the state.
The billionaire visited the Las Vegas church on Sunday to address the congregation about issues facing the black community, his campaign said.
The former Democratic primary frontrunner was on the campaign stump in Nevada yesterday, visiting Las Vegas and a Henderson college campus.
"Bernie I'm your biggest supporter and I'm here to ask you to stop propping up the dairy industry and stop propping up animal agriculture," said Priya Sawhney, of the protesters.