Two hundred seventy votes. That's all that's needed for state legislatures to undermine the checks and balances imposed by the Electoral College. The National Popular Vote bill already has the approval of 16 jurisdictions with 196 votes. Once it hits a majority of the 538 electoral votes (270), it will be a binding agreement among these jurisdictions
When Al Gore won the national popular vote in 2000, but lost the election, he was the first to do so in over 100 years. Following this loss, California millionaire John Koza came up with a plan to reinvent the rules of the game. Koza proposed an “end run” that would allow states to circumvent the Constitution without amending it. Rather than state electors making their decisions based on their state's composition, states would instead give way to the most populous cities.