As usual, I'm not sure the Democrats have actually thought this through. If Colorado is just going to vote whatever the national vote does, then why campaign at all in Colorado? All that money spent campaigning in the state...just bypass it and campaign elsewhere.
Colorado votes would be included in the national popular vote. The goal would be to get the most popular votes from all 50 states and DC.
A successful nationwide presidential campaign of polling, organizing, ad spending, and visits, with every voter equal, would be run the way presidential candidates campaign to win the electoral votes of closely divided battleground states, such as Ohio and Florida, under the state-by-state winner-take-all methods. In the 4 states that accounted for over two-thirds of all general-election activity in the 2012 presidential election, rural areas, suburbs, exurbs, and cities all received attention—roughly in proportion to their population.
The itineraries of presidential candidates in battleground states (and their allocation of other campaign resources in battleground states, including polling, organizing, and ad spending) reflect the political reality that every gubernatorial or senatorial candidate knows. When and where every voter is equal, a campaign must be run everywhere.
With National Popular Vote, when every voter is equal, everywhere, it makes sense for presidential candidates to try and elevate their votes where they are and aren't so well liked. But, under the state-by-state winner-take-all laws, it makes no sense for a Democrat to try and do that in a Red or Blue state, or for a Republican to try it in a Red or Blue state.
Because of state-by-state winner-take-all laws for Electoral College votes, not mentioned, much less endorsed, in the Constitution . . . Colorado, now Blue, is not expected to be visited by presidential candidates in the 2020 general election.
Almost all small and medium-sized states and almost all western, southern, and northeastern states are totally ignored.
Our presidential selection system has cut out
4 of every 5 people living in America from the decision. Presidential elections shrink the “sphere” (to use Madison’s coinage) of public debate to only a few thousand swing voters in a few states.
The Cook Political Report, as of Jan. 10, 2019, believes “There are just five toss up states, representing 86 electoral votes: Arizona, Florida, Michigan, Pennsylvania and Wisconsin.”
The Columbus Dispatch, as of Jan. 9, 2019, believes there will be “just seven states [with 105 electoral votes, where the winner is not predictable already] to allocate. Trump will be 66 electoral votes shy of re-election and the Democratic ticket will need 41 electoral votes to win back the presidency. The seven states are Arizona (11), Florida (29), Michigan (16), New Hampshire (4), North Carolina (15), Pennsylvania (20) and Wisconsin (10).”
Wisconsin Gov. Scott Walker in 2015 was correct when he said
"The nation as a whole is not going to elect the next president,"
“The presidential election will not be decided by all states, but rather just 12 of them.
Candidates have no reason to poll, visit, advertise, organize, campaign, or care about the voter concerns in the dozens of states where they are safely ahead or hopelessly behind.
With the end of the primaries, without the National Popular Vote bill in effect, the political relevance of 70% of all Americans was finished for the presidential election.
In the 2016 general election campaign
Over half (57%) of the campaign events were held in just 4 states (Florida, North Carolina, Pennsylvania, and Ohio).
Virtually all (94%) of the campaign events were in just 12 states (containing only 30% of the country's population).
In the 2012 general election campaign
38 states (including 24 of the 27 smallest states) had no campaign events, and minuscule or no spending for TV ads.
More than 99% of presidential campaign attention (ad spending and visits) was invested on voters in just the only ten competitive states.
Two-thirds (176 of 253) of the general-election campaign events, and a similar fraction of campaign expenditures, were in just four states (Ohio, Florida, Virginia, and Iowa).
In the 2008 campaign, candidates concentrated over 2/3rds of their campaign events and ad money in just 6 states, and 98% in just 15 states. Over half (57%) of the events were in just 4 states (OH, FL, PA, and VA).
In 2004, candidates concentrated over 2/3rds of their money and campaign visits in 5 states; over 80% in 9 states; and over 99% of their money in 16 states.