Senate roadblocks threaten to box in Biden

The Senate is looming as a roadblock for several of President-elect Joe Biden's policy priorities as Democrats start to assemble their 2021 agenda.

Biden and congressional leaders pledged to tackle a bold, aggressive slate of legislation when they felt bullish about their chances for a Democratic trifecta for the first time since 2010 and amid fierce pressure from their base to go big after four years of President Trump.

But in a setback, Biden will at best have a 50-50 Senate majority or, more likely, find his party in the...