From the Washington Post:

Those involved in the effort [to enact the National Popular Vote Interstate Compact] doubt that the electoral college delegate procedures can be changed in enough states before the 2020 presidential election, Reed Hundt, chairman and co-founder of Making Every Vote Count, told The Washington Post.

Because Republican-controlled legislatures haven’t embraced the effort, it will be difficult to reach the 270 combined electoral votes needed to become president, he said. (They remain hopeful, though, that the compact will be in effect for the 2024 presidential election.)

…

To Hundt’s point, Tuesday’s vote in Nevada was along party lines, with all Republicans voting against the proposal, NPR reported.

“All the Democratic legislatures and governors will end up passing it by [next spring],” expects Hundt, who previously served as chairman of the Federal Communications Commission.

“The people in those states by a two-thirds margin support the national vote winner always becoming president,” he added. “They’re happy to go along with the will of the people.”