Obviously it’s because he’s black (Sheila Jackson Lee-logic alert).

Washington (CNN) — Barack Obama’s base is behind another term for the president, according to a new CNN/ORC International poll.

Seven in 10 Democrats say they’d like to see Obama as their party’s presidential nominee next year.

That figure may seem promising, but support for Obama’s re-nomination has fallen 11 percentage points since June.

Without a prominent primary challenger, Obama’s bid for re-election seems to be safe for now. But of those losing faith, the poll reveals that moderate Democrats are more likely than liberals to say the party should nominate someone else and younger Democrats are more likely to favor a new nominee than those who are older.