Without having read the other submissions:
Obama: smart
McCain: senile
Palin: annoying
Biden: loud
Obama: Serious
Biden: Igor
McCain: Codger
Palin: Rabid
Harper - Narcissistic A-hole (ok thats two words but I hate him too much for one word)
Dion - Bland
Layton - Smarmy
Duceppe - Ineffectual
May - Passionate
I am not a huge fan of any of the leaders so I am voting strategically for the best shot to not elect a damn conservative.
Gotcha ya?
Obama: Thoughtful
McCain: Emotional
Biden: Aggressive
Palin: Mistake
Obama: Future
McCain: Failure
Biden: Politician
Palin: Jackass
Couldn’t figure out how to combine yapping and jackass.
Obama: future/hope (can’t decide)
McCain: cynical
Biden: competent
Palin: arrogant
Obama - Presidential
McCain - Unstable
Biden - Seasoned
Palin - Annoying
Obama - Idealist
McCain - Luddite
Biden - Blunt
Palin - Incompetent
Obama: Intelligent
McCain: Pathetic
Biden: Decent
Palin: Terrifying
Obama: Rational
McCain: Pitiful (as in, I look at him and feel an ache of pity)
Biden: Honest
Palin: Dangerous
Obama - Pragmatic
McCain - Crotchety
Biden - Loud
Palin - Embarrassing
Braying?
Obama: Overrated
McCain: Meh
Biden: Jerk
Palin: Ditzy
Obama: Hope
McCain: Expired
Palin: Scary
Biden: Typical
Obama: Green
McCain: Doddering
Palin: Hen
Biden: Squinty
Obama: Tall
Biden: Garrulous
McCain: Tired
Palin: Shrill