Historically, the vast majority of Presidential contenders and nominees have come from no further west than the Great Plains.
And only two Presidential nominees, Richard Nixon, and Ronald Reagan, have been elected from the vast area west of the Great Plains. Even Nixon, when he ran for President the second time in 1968, was actually a resident of New York, while Reagan had spent his early life in Illinois, before migrating to Hollywood for an acting career.
Only two Presidential candidates, other than Nixon and Reagan, have made it as the nominees of their party, both from Arizona–Senators Barry Goldwater and John McCain.
The Mountain States have been particularly lacking in Presidential contenders historically, with only Senator Gary Hart and Congresswoman Patricia Schroeder of Colorado; Governor Bill Richardson of New Mexico; Governor Bruce Babbitt of Arizona; and Senator Frank Church of Idaho having ever conducted campaigns for President, along with Senator William Borah of Idaho early in the 20th century.
Now, we have two Coloradans, former Governor John Hickenlooper and Senator Michael Bennet, contending for the Democratic Presidential nomination, and the soon to be contending Governor Steve Bullock of Montana, expected to announce in mid May.
Looking at the Pacific Coast states, we have only had Governor Jerry Brown of California and Senator Henry (Scoop) Jackson of Washington who have contended for the Presidency, along with Senator Hiram Johnson of California attempting a run in the early 20th century.
Now, we have Senator Kamala Harris of California and Congressman Eric Swalwell of California, Governor Jay Inslee of Washington, and Congresswoman Tulsi Gabbard of Hawaii, all running for the Democratic Presidential nomination.
Other than California, the likelihood of a future nominee or winner of the Presidency from those states west of the Great Plains would seem to be highly unlikely, as the population is much smaller than in the rest of the nation, although growth has been going on in some of those states, particularly Colorado, Arizona, and Washington.