Futures markets on 20 world events: Are these prices too high or too low?

[Stranger in a strange land]

Intrade:
Assad to no longer be Syrian president by Dec. 31, 2012: 53.9% - too high, though I doubt he'll still be in power 2 or 3 years from now
USA and/or Israel to launch air strike against Iran before Dec. 31, 2012: 25.9% - too high
Republicans to win control of US Senate in 2012 elections: 51.8% - about right
Any country currently using Euro to announce intention to drop it by Dec. 31, 2013: 50.0% - about right
Any country currently using Euro to announce intention to drop it by Dec. 31, 2014: 62.5% - about right

Paddy Power:
Euro to no longer exist as an official currency in 2016: 20% - too high
Next Pope to come from South or Central America: 27% - about right

Betfair: don't know enough to intelligently comment

Ladbrokes:
Ed Milliband to be Labour leader at next UK general election: 75% - don't know
Andrew Cuomo to be 2016 Democratic nominee for president: 7.7% - too low
Joe Biden to be 2016 Democratic nominee for president: 9.1% - about right
Hillary Clinton to be 2016 Democratic nominee for president: 25.0% - no way to say: if she runs it's basically hers, but there's no telling if she will or not
Hillary Clinton to be elected US president in 2016: 14.3% - see previous
Jeb Bush to be elected US president in 2016: 4.8% - too high
Marco Rubio to be elected US president in 2016: 4.8% - about right

Sportsbet: don't know enough to intelligently comment