Ok so for this example assume that the 1n reads a ptix scenario that is debt ceiling, with the link being that passing the plan costs a lot so republicans won't vote for the debt ceiling to pass, causing econ collapse. So now the aff can respond to the link debate by reading winners win, which would say something like democrats have a lot of political momentum beacuse they've been able to pass a lot of bills lately, so they'll be able to pass the debt ceiling.
Winners win can also be a neg extension. I'm too lazy to come up with a scenario right now, but they exist.
Also, I don't read politics every round, so my explanation might've been lacking/wrong in some ways, but I'm pretty confident that it's all about political momentum.
But yeah, good luck.