Maybe Michaud's loss has to do with his homosexuality.
Of course, one could say, he had been reelected to the more conservative of Maine's two congressional district several times, but the truth is, that was before his coming out. Plus he hasn't won any of the counties in that district.
It had quite a bit to do with his homosexuality. See:
https://uselectionatlas.org/RESULTS/state.php?fips=23&year=2005&f=0&off=50&elect=0Also why I find laughable the idea that there are "very few cultural Christian conservatives in Maine."
This was something of a banner year for homophobic campaigns, unfortunately. DeMaio-Peters and, to a lesser extent, Gibson-Eldridge saw some extremely nasty dog-whistling, and there were also some slightly dog-whistleish ads aired on behalf of Seth Moulton over here. ("Seth Moulton served our country during four tours in Iraq..."
blue-tinted photo of Moulton in combat gear "...career politician Richard Tisei..."
pink-tinted unflattering photo of Tisei).