The Canucks just choked. I
should be happy they made it to the playoffs, but blowing a 2 goal lead pisses me off. Gah! Three more wins in a row ain't happening.
Also: "Believe in Blue", while I've actually heard that phrase more than once or twice in previous years myself (and honestly, have heard/noticed it maybe once this year), this year it probably stems from Luongo... as after his great saves the crowd ominously lets out a deep "LOUUUUUUUUUUUUUUUUU". So the connection? Luongo, for all intents and purposes is the reason the Canucks are in the playoffs, and the corporate spin that likes coming up with catchphrases probably didn't want to have the focus entirely on Roberto with a more accurate "Believe in Lou".
Besides, other fans have (directly) ripped off Vancouvers "towel power" thing so don't even worry about who's ripping off who.
Personally, my rooting goes like this: (As established years ago)
Canucks
A "canuck" team (minus toronto)
Any team that gets ice in winter (minus detroit)
Toronto
Detroit
Teams that never see snow on a regular basis (minus dallas)
Dallas
I have a distaste for Toronto and Detroit because their fans (the ones I know at any rate) are obnoxious. Toronto is currently higher on my list because at least their consistent losing has one friend shut up at the moment.

Dallas' shitty ice is the reason I originally established my dislike for cities with no actual winter (that stole a team from a solid hockey town) and to commemorate that they get the spot at the bottom.
After that it comes down to the players I like, which one is the underdog, and whatever. For example, the sens vs pens series was pretty much me cheering for both teams, cuz well, I liked the pens for years and ottawa is the place that wastes my taxes. So it balanced out. XD
In this round though, I'd cheer for the Sens and the sabres over the Rangers and Devils just because the two s-teams don't have the historical records of the teams they face in terms of making it to the cup. +1 underdogs.
Huge distaste for the California and Florida teams. And Texas!
They play foosball in texas! I mean what the hell...
/me wanders off muttering about how hockey should be played in winter, on real ice, with fans wearing parkas, stamping their feet and drinking hot chocolate...