Their primary election constituencies demand it. Arguably a more democratic process in the primaries has given more power to fringe voters who show up, and take

Their primary election constituencies demand it. Arguably a more democratic process in the primaries has given more power to fringe voters who show up, and taken power away from the elitism but stabilizing process found in caucusing. As the motivated extreme participants win primaries, you see polarized general elections, and polarized governing strategies. Whatever complaints you have about elected officials, they represent a constituency of rabid primary voters, and a lot of PAC money. Either improve primary election participation; or eliminate primaries (next to impossible, the parties own the state defined election process which includes the primary system) in favor of range or preferential voting or even old school run offs; or revert to party elites having more say in primaries.