The (nine largest) states of California, Texas, Florida, New York, Pennsylvania, Illinois, Ohio, Georgia, and North Carolina add up to 222 votes in the House, and adding in the number of Senators shows the Electoral count at 240. The Electoral College consists not of 535, but of 538 electors -- under the 23rd Amendment of the Constitution, the District of Columbia is allocated 3 electors and treated like a state for purposes of the Electoral College. Because that's an even number (nice amending, asswipes!), a majority of 270 electoral votes is required. Add in Michigan (13+2) and New Jersey (12+2) and it's just one vote short of the 270. Add Virginia (11+2) and ta-dah -- the twelve largest states are enough. The reality is, these twelve states are not going to vote monolithically for the same candidate.
NPV (sounds like a sexually transmitted disease, don't you think?) is a state-by-state measure that, when the number of electoral votes reaches or exceeds 270, goes into effect in all states which pass it. It's been enacted into (so far non-functioning) law in California, Colorado, Connecticut, District of Columbia, Hawaii, Illinois, Massachusetts, Maryland, New Jersey, New York, Rhode Island, Vermont, and Washington. In Delaware it is awaiting the gov's signature, and it was been passed by one or the other house in a few other states.
It isn't really much of a reform, and even if it passes in time for the 2020 election (my guess is, it will eventually die on the vine, dangling out there like some of the proposed but unratified Constitutional amendments) it's probably going to bite the Demagogic Party in the ass -- imagine the gnashing of teeth and lamentations when ALL of California's electoral votes HAVE TO be cast for President Trump...
| House | Subtotal | Senate | Electoral Subtotal | |
| California | 53 | 53 | 2 | 55 |
| Texas | 36 | 89 | 4 | 93 |
| Florida | 27 | 116 | 6 | 122 |
| New York | 27 | 143 | 8 | 151 |
| Pennsylvania | 18 | 161 | 10 | 171 |
| Illinois | 18 | 179 | 12 | 191 |
| Ohio | 16 | 195 | 14 | 209 |
| Georgia | 14 | 209 | 16 | 225 |
| North Carolina | 13 | 222 | 18 | 240 |
| Michigan | 14 | 236 | 20 | 256 |
| New Jersey | 12 | 248 | 22 | 270 |
| Virginia | 11 | 259 | 24 | 283 |
| Washington | 10 | 269 | 26 | 295 |
| Arizona | 9 | 278 | 28 | 306 |
| Massachusetts | 9 | 287 | 30 | 317 |
| Tennessee | 9 | 296 | 32 | 328 |
| Indiana | 9 | 305 | 34 | 339 |
| Missouri | 8 | 313 | 36 | 349 |
| Maryland | 8 | 321 | 38 | 359 |
| Wisconsin | 8 | 329 | 40 | 369 |
| Colorado | 7 | 336 | 42 | 378 |
| Minnesota | 8 | 344 | 44 | 388 |
| South Carolina | 7 | 351 | 46 | 397 |
| Alabama | 7 | 358 | 48 | 406 |
| Louisiana | 6 | 364 | 50 | 414 |
| Kentucky | 6 | 370 | 52 | 422 |
| Oregon | 5 | 375 | 54 | 429 |
| Oklahoma | 5 | 380 | 56 | 436 |
| Connecticut | 5 | 385 | 58 | 443 |
| Iowa | 4 | 389 | 60 | 449 |
| Utah | 4 | 393 | 62 | 455 |
| Arkansas | 4 | 397 | 64 | 461 |
| Nevada | 4 | 401 | 66 | 467 |
| Mississippi | 4 | 405 | 68 | 473 |
| Kansas | 4 | 409 | 70 | 479 |
| New Mexico | 3 | 412 | 72 | 484 |
| Nebraska | 3 | 415 | 74 | 489 |
| West Virginia | 3 | 418 | 76 | 494 |
| Idaho | 2 | 420 | 78 | 498 |
| Hawaii | 2 | 422 | 80 | 502 |
| New Hampshire | 2 | 424 | 82 | 506 |
| Maine | 2 | 426 | 84 | 510 |
| Rhode Island | 2 | 428 | 86 | 514 |
| Montana | 1 | 429 | 88 | 517 |
| Delaware | 1 | 430 | 90 | 520 |
| South Dakota | 1 | 431 | 92 | 523 |
| North Dakota | 1 | 432 | 94 | 526 |
| Alaska | 1 | 433 | 96 | 529 |
| Vermont | 1 | 434 | 98 | 532 |
| Wyoming | 1 | 435 | 100 | 535 |
| District of Columbia (has no vote in the House or Senate) | 1 | 436 | 102 | 538 |
| Puerto Rico (has no vote in the House, Senate, or EC) | 1 |