The old party was replaced by a new party wth new party platforms, the literal definition of a new party- and yes, several third parties began to win local elections. No; by definition if the democratic party splits into a new subsection, it's a new party. To give you a route to 270 and address your claim directly; Historically, third parties failed because the overwhelming majority of Americans fiercely identified as either Democrats or Republicans. However, political analyst Yascha Mounk notes that the number of self-identified independents has grown significantly, at times rivaling or outnumbering either major party. Because the traditional party bases have shrunk, a third-party candidate no longer needs to convince die-hard partisans to switch sides. If a candidate can consolidate the vast majority of independent voters, they only need to siphon off a small fraction of disillusioned, soft Democrats or Republicans to become competitive in a three-way race.