the president has the impact of the most powerful endorsement in the country. Technically, the president’s impact on legislation is just his ability to veto, but in practice both parties operate in tandem with the executive and legislative branches, the president is the figurehead of the party and the strategy has generally been to rally behind their campaign platform. With Biden we’ve had the inflation reduction act and the infrastructure bill. Obama famously drove the affordable care act, even though they personally didnt get to vote on it.