After weeks of wrangling , Northern Ireland’s Democratic Unionist Party agreed on Monday to give Prime Minister Theresa May the votes she needs to stay in office and push through legislation ensuring that the United Kingdom exits the European Union. While the Democratic Unionist leader, Arlene Foster, spoke of the deal being “in the national interest” of the U.K. as a whole, commentators pointed to what looked like a massive concession to Northern Ireland’s local government — an additional 1 billion pounds in social welfare spending.

Arlene Foster explains why the DUP's deal with Theresa May was "in the national interest" https://t.co/kLq8uTYnEl pic.twitter.com/Yosburku7T — Bloomberg (@business) June 26, 2017

Theresa May shows how she will stand up to EU's hard negotiators demanding cash by giving DUP £1bn in cash. — David Allen Green (@davidallengreen) June 26, 2017

The money, though, was probably less important to the D.U.P. than staving off what it sees as a nightmarish alternative: the specter of Jeremy Corbyn, the leader of the opposition Labour Party, becoming prime minister. That’s because the election campaign that just concluded, with a hung Parliament in which no single party holds a majority of seats, kicked off a remarkable surge in popularity for Corbyn. That surge, lifting Corbyn and Labour, has shown no signs of abating since the votes were cast on June 8. The Labour leader was widely seen to have handled the aftermath of the tragic fire at Grenfell Tower in London better than the prime minister — comforting victims as she dodged the public — and opinion polls suggest that his party would win a new election if May is unable to govern.

Panelbase Poll - the Sunday Times today:



Labour 46%

Conservatives 41%



Approval ratings

Corbyn +17%

May -17%



Labour are a govt in waiting. — George Aylett (@GeorgeAylett) June 25, 2017

While Corbyn’s plans to end austerity and reverse cuts to social-welfare spending are anathema to the Conservatives, his long history of support for Sinn Fein, the former political wing of the I.R.A., has made him into a hate figure for the D.U.P. whose voters identify as British, not Irish, and fear being eventually absorbed into a united Ireland. Scenes of the rapturous reception for Corbyn this weekend at the Glastonbury music festival — where he quoted Percy Bysshe Shelley and heard his name sung repeatedly to the tune of the White Stripes’ anthem “Seven Nation Army” — must have instilled a sense of fear bordering on panic in both the Conservative and D.U.P. camps.

"Oh, Jeremy Corbyn, Oh Jeremy Corbyn". Glastonbury crowds cheer the Labour leader as he delivers a political speech. pic.twitter.com/uULZIoRWBG — Channel 4 News (@Channel4News) June 24, 2017

Thank you #Glastonbury for inviting me to speak on the Pyramid Stage about how, together, we can build a country #ForTheMany, not the few. pic.twitter.com/vutOyFsFSo — Jeremy Corbyn (@jeremycorbyn) June 24, 2017

The chant of “Oh, Jeremy Corbyn,” continued to ring out around Glastonbury all weekend, even after the man himself had left the stage.

After the terms of the deal between the government and the D.U.P. were made public on Monday, Corbyn denounced the agreement as not “in the national interest, but in the interest of Theresa May and the Conservatives’ own political survival.”

This Tory-DUP deal has not been done in the national interest but in the interest of @Theresa_May & @Conservatives' own political survival. pic.twitter.com/BqtPwJByIl — Jeremy Corbyn (@jeremycorbyn) June 26, 2017