Here is Representative Seth Moulton on the national popular vote:
People often defend the electoral college by arguing that without it, presidential candidates would pay attention to only a few states. But that’s already the case because of the electoral college: Two-thirds of general-election presidential campaign events in 2016 were held in just six states, and 94 percent were held in just 12 states. In a winner-take-all-electoral-votes system, candidates campaign only in the states that are a toss-up.
But if we abolish the electoral college — either through a constitutional amendment or a national popular-vote compact— presidential candidates could earn votes anywhere, making them far more likely to campaign everywhere. Then, no matter where you live or how your neighbors vote, your vote would matter. As it should.