German Chancellor Angela Merkel and her main challenger Martin Schulz embarked on Saturday on the final round of their electoral campaign ahead of Sunday’s elections.
Both are united in their appeal to Germans to shun anti-migrant populists.
Merkel, of the Christian Democratic Union, is visiting districts in the town of Greifswald and the island of Ruegen where the Islamophobic Alternative for Germany (AfD) topped her party's score in state elections last year.
Social Democrat chief Schulz meanwhile will take his rally to Aachen, a western city next to his hometown of Wuerselen.
Although Merkel's party enjoys a double-digit lead over the second place SPD, alarm is growing among mainstream parties as the latest polls show support for the hard-right AfD rising in the final campaigning stretch to between 11 and 13 percent.
That means that around 60 lawmakers of the openly anti-immigration party could sit in the German parliament for the first time since World War II, a prospect prompting established parties to urge voters to shun the upstarts.
At Merkel’s final major stump speech on Friday evening at the southern city of Munich, dissenters blew whistles and vuvuzelas and chanted "get lost", seeking to drown her out.
But the 63-year-old refused to be derailed from her stability-and-prosperity stump speech, telling the crowd that "the future of Germany will definitely not be built up through whistles and hollers."
Merkel, whose rallies across Germany had been plagued by organized AfD supporters, also called people to go out and "vote for the parties that are 100 percent loyal to our constitution".
In an appeal for voters to close ranks and keep the AfD out, Schulz told a rally in central Berlin that "this Alternative for Germany is no alternative. They are a shame for our nation."
Foreign Minister Sigmar Gabriel, also a Social Democrat, said the party is led by "people who incite hate, who spread Nazi propaganda".
"For the first time since the end of the Second World War, real Nazis will sit in the German parliament," said Gabriel.
Two months of campaigning have been largely low-key, with few hot-button issues dividing the main contenders.
While Merkel has been pushing her stability and prosperity agenda and Schulz seeking to sway voters with his pledges for greater social equality, the AfD has diverted attention.
Sueddeutsche Zeitung columnist Heribert Prantl praised the chancellor for not only pressing on with her rallies despite protests from AfD supporters, but also giving a clear rebuttal to the populists.
But the columnist regretted that it only came late in the campaign when it became "clear how the political climate in Germany will change with the AfD in the Bundestag."
"Not only nationalist politicians, but racists and bigots too will enter parliament," he wrote, adding that "the seriousness of the situation was only recognized too late."
Thorsten Benner, director of the Global Public Policy Institute in Berlin, said the AfD "will challenge key themes" in parliament, warning that taboos since 1945 that could be breached include how Germany views its World War II past and the question of what makes a German.
One of two AfD leading candidates, Alexander Gauland, had called for Germans to stop atoning for the war past.
He had also sparked outrage when he said integration commissioner Aydan Ozoguz should be "disposed of in Anatolia", suggesting that she will never be German because of her Turkish origin.
Merkel, already chancellor for 12 years, has run a low-key campaign emphasizing the country's sinking unemployment, strong economic growth, balanced budget and overall stability in a volatile world.
Pre-election polls give her conservative Union bloc a lead of 13 to 17 points over Schulz. The two are traditional rivals but have governed together in a "grand coalition" of the biggest parties for the past four years.
Schulz returned to German politics in January after years as the European Parliament's president. He has struggled to gain traction with a campaign that centered on righting perceived economic injustices for Germany's have-nots. It's also been difficult for him to carve out clear differences with the conservatives.
Merkel offered Germans "a combination of the experience of recent years, in which we have achieved plenty, and curiosity for the new" during the pair's only head-to-head debate of the campaign.
Merkel is pledging to get from Germany's current 5.7 percent unemployment rate — down from 11 percent when she took office in 2005 — to "full employment" by 2025. She pledges limited tax cuts and to keep Germany's borrowing at zero.
And she offers a steady hand internationally, with long experience of European Union negotiating marathons, tough talks with Russian President Vladimir Putin, and now of engaging cautiously with President Donald Trump.