President Joe Biden endorsed a plan to shake up the Democratic presidential primary calendar by elevating states with more diverse electorates. Summary President Joe Biden endorsed a plan to shake up the Democratic presidential primary calendar by elevating states with more diverse electorates. President Biden urged Democrats to drop “restrictive” caucuses and prioritize diversity and variety – “demographic, geographic, and economic” in their party’s nominating process. Instead, Biden wants South Carolina to hold the first nominating contest, followed by New …