There's a movement among states to end the effect of the electoral college without changing the US Constitution. Some states are passing legislation where their electoral college is legally bound to vote for the candidate who  7ff2   won the national, popular vote. The measures will go into effect when enough states pass the same legislation that a majority of the electoral college is under these rules. Once there are enough states with those rules, whoever wins the popular vote nationally, will be guaranteed to win the electoral college. About the only Constitutional push back would be to force states to allow rogue/dissenting electors, who vote against the will of their state (almost never happens).