Update:
Little change on the Democratic nomination odds, but there's now a new betting outfit (called Stan James) that's offering slightly different odds:
http://www.oddschecker.com/specials/politics-and-election/us-presidential-election-2016/democrat-candidateClinton 5/2
Cuomo 8/1
Biden 10/1
O'Malley 10/1
Warren 14/1
Warner 22/1
Feingold 25/1
Kaine 25/1
Patrick 25/1
Emanuel 28/1
Hickenlooper 28/1
Schweitzer 28/1
Sebelius 28/1
And Ladbrokes has added contracts on Romney and some additional Republicans in the winning individual market:
Romney 5/1
Clinton 6/1
Ryan 8/1
Rubio 16/1
Biden 20/1
J. Bush 20/1
Cuomo 25/1
Jindal 25/1
O'Malley 25/1
Walker 33/1
Christie 40/1
Warren 40/1
Christie only half as likely as Jeb Bush to be elected president in 2016? Seems like a stretch.