A new LA Times/Bloomberg poll shows that Democratic voters aren't enthusiastic about an Obama/Clinton ticket:

Among Dem Voters:
Yes, choose Clinton - 36
No, don't choose Clinton - 42
Don't know - 22

Among Independent Voters:
Yes - 30
No - 46
Don't know - 24

Among women voters:
Yes - 43
No - 35
Don't know - 22

However, most Democratic voters would still vote for Obama if Clinton was on the ticket.

More likely - 34
Less likely - 9
No effect - 54

Among Independents, we see similar numbers:

More likely - 29
Less Likely - 11
No effect - 56