"Obama's looking weak for re-election in 2012."

According to a new McClatchy-Marist poll:

Nearly half of his own base — 45 percent of Democrats and Democratic-leaning independents — want someone to challenge him for the Democratic nomination...

And, assuming he wins re-nomination, barely more than 1 in 3 voters, or 36 percent, said they'll definitely vote for him, while nearly half, 48 percent, said they'll definitely vote against him....

Among groups lining up against Obama early:

Whites, by a margin of 57-27

• Men, 55-31
• Independents, 50-30
• Midwesterners, 51-35
• Southerners, 54-32
• Westerners, 47-41

Those planning definitely to vote for him rather than against him:

• Minorities, by a margin of 57-28
• Northeasterners, 39-36
• Liberals, 74-17

The strategy for Obama is obvious: Make more liberals!