Once a swing state in presidential elections, Colorado has teetered on the brink of becoming solidly Democratic. Donald Trump may have pushed it over the edge.

Trump's disparaging words about Mexicans, negative comments about women and weak campaign organization have punctuated the state's shift from a nip-and-tuck battleground to one that's Democrat-friendly.

For the first time in more than 20 years, there are now more registered Democrats in the state than Republicans.

And it's not just Colorado. Trump's inflammatory rhetoric and weak campaign structure could ensure that perennially competitive Nevada and New Mexico are out of reach as well.

That matters for Trump. He can't win the 270 electoral votes needed to capture the presidency without capturing some states that favored Barack Obama in the last two elections.