Ovechkin doesn't elbow to the head and never has, and last I checked, hitting high is legal as long as it's with the shoulder.
The Campbell suspension from last year wasn't even a hit, it was a push into the boards at high speed. Players shove each other every game, and it wasn't for dirty headhunting like you describe (he jumps high at players!). That wouldn't even be a suspension in the playoffs, Richards/Connolly was a prime example. Proof:
Ovi's push:
http://www.youtube.com/watch?v=Vb6EfttNhGI
Richards' push:
http://www.youtube.com/watch?v=_SHMEVwHuG4
Ovi's push just knocked the wind out of the guy, and I think it was a questionable suspension. Should have only been a major. If that's the worst you can find on Ovi, then your argument is very weak.
Chara on MaxPax, definitely agree. It was late and it was flagrant, and I'm still salivating at seeing what Montreal will do next season in retaliation. They haven't forgetten, you can bet on that. But like others have said, playoff suspensions are a whole nother beast. It's more of an eye for an eye, as in you take their player out for an entire series on something dirty then they're not going to let you off easy. If the player hit is ok, then no suspension (see Bolland's hit on Bieksa, Richards hit above). The league can claim that it's not affected by whether a player gets knocked out of a series/season but we all know it's horseshit (one thing I actually agree with Don Cherry on). In the playoffs, anyway.