It's that we've been calling it a "holiday tree" and not a "Christmas tree." So you see, both sides of the political spectrum are willing to grab attention and make us feel bad about what most people in Wisconsin just like and feel good about for unexamined reasons.
Who cares what the thing is officially called?
That's easy: ideologues. Most ordinary people, I think, don't want any political fighting stirred up over Christmas. Look who's doing the stirring here: "46 state legislators, mostly Republicans, wrote and signed a letter to Gov. Jim Doyle...." Doyle is up for reelection next year -- have you heard?
Warm greetings of the season... the election season.