Your challenge is to have the moderate Democratic Governor of Colorado, Richard 'Dick' Lamm get elected President as a Democrat. Added points if you can have him beat an incumbent President.
I'm not sure I'd describe him as a moderate. Just because someone's views don't fit neatly into traditional liberal-vs.-conservative labels does not make him a "moderate"--on the contrary, some such views can be pretty extreme.
"In 1984, his outspoken statements in support of
physician-assisted suicide generated controversy, specifically over his use of the phrase "we have a duty to die." Lamm later explained that he "was essentially raising a general statement about the human condition, not beating up on the elderly," and that the exact phrasing in the speech was "We've got a duty to die and get out of the way with all of our machines and artificial hearts and everything else like that and let the other society, our kids, build a reasonable life."
[11] His dire predictions for the future of social security and health care ("duty to die") earned him the nickname "Governor Gloom"."
https://en.wikipedia.org/wiki/Richard_Lamm
No major national party is likely to nominate a presidential candidate who talks that way. Besides, in 1984 and 1988, Gary Hart pretty much made it impossible for any other Coloradan to seriously seek the presidential nomination, and in 1992 Lamm couldn't even get the Democratic nomination for the US Senate.