"While president, Obama will announce support for means testing Social Security - 70%"
I'd be wiling to take those odds, with some refinements.
How about this - I win if before he leaves office I can point to a speech Obama gave in which he advocates means testing Social Security. Otherwise you win. The speech has to be given after today, so you don't fear this is some kind of trick.
If I win I get $100 from you. If you win I give you $233. But with these odds I'm indifferent to making the bet. So for me to be willing to bet I want you to agree that if Obama makes such a speech you have to pay me right away.
I would like to propose this as a thread for people to write in their predictions for the next year and the next decade, when practical with probabilities attached. I'll probably make some in the comments.