As the House of Representatives passed the American Health Care Act (ACHA) to repeal Obamacare, singing echoed from Congress’s halls: “Na, na, na, na, hey, hey, hey, goodbye!”

But the singing wasn’t Republicans saying goodbye to Obamacare.

Instead, it was Democrats saying goodbye to Republicans. Based on the AHCA’s atrocious polling (as low as 17 percent), Democrats widely believe this bill will be a total disaster for Republicans who voted in favor of it. And that could help them win back the House of Representatives in 2018 — the first time they would have a majority in the House since big Republican victories in 2010.

So while the AHCA’s passage (and it still needs to go through the Senate to become law) would be a huge blow to the millions of people who would lose their insurance due to it, to the Democratic agenda, and to President Barack Obama’s legacy, Democrats are ready for a fight.