Later that day, at a restaurant in Papillion, a group of three other 2020 ticket-splitting voters sipped iced coffees as they assessed Washington under unified Democratic control. All three had voted for Mr. Biden, but none supported the drive by many congressional Democrats to blow up the filibuster to pass Mr. Biden’s most ambitious agenda items. These voters preferred a scaled-back infrastructure package that, even if it left major spending on education and climate on the table, could pass with bipartisan support and represent a show of unity. “It’s one of those things that kind of builds relationships to get things going,” said Michael Stark, 30, an independent. The filibuster is “there for a purpose and I am terrified of what would happen if it went away,” said Corbin Delgado, 26, a Democrat who works for a nonprofit group and is the secretary of his party’s state Latinx Caucus. He said his top issue was immigration reform, including a pathway to citizenship for the undocumented.