Donald Trump speaks alongside New Jersey Gov. Chris Christie, left, at the Mar-a-Lago in Palm Beach, Fla., on Super Tuesday. (Photo by Jabin Botsford/The Washington Post)

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NEW ORLEANS — The 2016 election pressed forward Saturday as voters began casting their ballots here in Louisiana’s Republican and Democratic primaries, one of five states holding presidential nominating contests across the country. Dubbed “Super Saturday,” Republicans will also caucus in Kansas, Maine and Kentucky. Democrats will caucus in Kansas and Nebraska.

The presidential race entered a new stage Tuesday after real estate mogul Donald Trump (R) and former secretary of state Hillary Clinton (D) secured victories in a majority of the 11 partisan primaries and caucuses held that day, when hundreds of delegates were at stake. Clinton — the Democratic establishment favorite — has pulled sharply ahead of rival Sen. Bernie Sanders, while Trump’s wave of populist support showed little sign of waning even as he has endured scathing attacks from GOP leaders.

Saturday’s contests will again pitch the election forward, as Clinton and Trump’s rivals seek to keep them at bay by maximizing their delegate counts. The two front-runners, meanwhile, are looking to protect their leads and to sustain their momentum ahead of a series of high-stakes, high-delegate races in mid-March.

“I don’t want to tell you that we’re 21 points up in Louisiana because you won’t vote,” a bullish Trump quipped Friday evening during a campaign event here in New Orleans. “You have to go out and vote, so let’s assume we’re tied, okay? Let’s assume. No, you have to go out and vote. “But if the days since Super Tuesday have revealed anything, it’s that this presidential election can’t stop — and won’t stop.

An unruly Republican presidential debate Thursday showed the urgent crossroads the GOP nominating contest has come upon. Sen. Ted Cruz (Tex.), Sen. Marco Rubio (Fla.) and Ohio Gov. John Kasich have struggled to position themselves as the chief alternative to Trump while Republican leaders have become increasingly vocal about their opposition to Trump.

The Cruz campaign has focused its efforts on Kansas and Maine, which hold caucuses instead of primaries and where Cruz’s strategic ground organization could be rewarded. Cruz — who has won four nominating contests and trails Trump by about 100 delegates — has increasingly positioned himself as the only candidate able to beat Trump. Cruz has made a direct appeal to libertarian-leaning voters in Maine, hoping to siphon off voters who once supported Sen. Rand Paul (Ky.).

“The liberty movement,” Cruz told an audience in Orono, Maine, on Friday, “believes passionately about the Constitution and Bill of Rights.” Trump, he said, will be “flexible” with the Constitution.

Rubio, in the meantime, is intent on winning the March 15 primary in his home state of Florida, though Trump appears to have an enormous lead in the Sunshine State. The Rubio campaign has remained steadfast in its belief that the senator can turn things around; a loss there would be devastating for Rubio and would give Trump all of the state’s delegates, which will be allocated on a winner-take-all basis.

Rubio will travel to Puerto Rico on Saturday evening, where voters are poised to give him a second primary win this cycle on Sunday. Victory in Puerto Rico could give Rubio a boost on Florida, where a significant bloc of Puerto Ricans have relocated amid ongoing economic turmoil on the island.

But there are signs that Rubio’s prospects are increasingly limited. He canceled campaign events in Kentucky and Louisiana this week in favor of campaigning in Kansas, where his campaign hopes to capture some delegates even though Trump is favored in polls of Republican voters. The campaign has dismissed speculation that the campaign’s decision to rearrange its travel schedule effectively means that Rubio realizes he cannot compete in Kentucky or Louisiana.

In the Democratic contest, Sanders is facing down questions about how much longer he can realistically stay in the race with Clinton’s prohibitive delegate lead; she has 1,058, including superdelegates, to his 431.

Sanders has a good chance to win caucuses in Nebraska and Kansas on Saturday, the campaign manager for Clinton said last week. And he is also likely to win a caucus Sunday in Maine, which is close to his home state of Vermont. But Clinton is likely to prevail in the Louisiana primary by a wide margin the same day — and that would make her still come out ahead on the delegate math, said campaign manager Robby Mook.

“We have no doubt that as long as Sen. Sanders remains in the primary, he will continue to win elections along the way, but it will make little difference to Hillary’s pledged delegate lead,” Mook wrote in a state-of-the-race memo released a day after her big victory on Super Tuesday.

The voting Saturday “will reinforce this point,” Mook wrote. Sanders “has clear advantages and is investing heavily in two upcoming caucuses,” Mook wrote of Nebraska and Kansas.

Sanders has spent roughly double what Clinton has on advertising in Nebraska. Clinton went to Omaha to collect the endorsement of Berkshire Hathaway chairman Warren Buffett but has not spent significant time campaigning there.

At a rally in Portland, Maine, last week, Sanders reminded the crowd how far he had come.

“We were up against the candidate supported by the entire political establishment, someone who had been anointed by the pundits,” he said. “Well guess what? It doesn’t look like she’s so inevitable now.”

The establishment wing of the Republican Party, meanwhile, is hoping for any sign that one of the remaining GOP candidates will be able to stop Trump’s seemingly steady march to the nomination, which has captured the imagination of millions of disaffected conservative voters around the country but has given establishment party leaders serious pause.

At the heart of their escalating attempts to end Trump’s bid is fear that his hard-line rhetoric against Mexican immigrants and anti-Muslim proposals could destroy the party’s chances of capturing the White House in the fall. They also fear that Trump’s rhetoric could deeply damage the party’s brand for elections to come.

Former Massachusetts governor Mitt Romney, the 2012 Republican nominee, denounced Trump in a scathing and unprecedented speech Thursday.

“Donald Trump is a phony, a fraud,” Romney said in a speech at the University of Utah on Thursday. “His promises are as worthless as a degree from Trump University. He’s playing members of the American public for suckers: He gets a free ride to the White House, and all we get is a lousy hat.”

Trump appears poised to charge forward, buoyed by a broad and faithful coalition of supporters who agree with his immigration positions and believe his wealth shields him from alliances with lobbyists and special interests.

But his campaign, sensing persistent and hostile attacks from the party’s leadership, says it is not yet looking to the general election.

“We need to get 1,237 delegates. If we don’t have that or more, it doesn’t matter,” said Corey Lewandowski, Trump’s campaign manager. “Our whole focus is on getting delegates. That’s our job.”

Anne Gearan, Emily Guskin, Katie Zezima and Ed O’Keefe contributed to this report.