What's the difference between a caucus and a primary?

Iowa’s Democratic Party says it will hold a caucus on Jan. 15 but won’t release the results until early March.

Iowa Republicans say the party’s presidential nominating caucuses will be held Jan. 15, on the federal holiday honoring Martin Luther King Jr. That announcement Saturday puts the first votes of the 2024 election a little more than six months away as the GOP tries to reclaim the White House.

No sooner had President Joe Biden told Democrats his preference for reordering the presidential primary calendar than states began balking.