The unbeatable president? Perhaps he’s closer to unelectable:

Americans are more likely to say his presidency has been a failure than a success, 50 percent-44 percent. His favorable rating is 50 percent, higher than the GOP presidential contenders but lower than every nominee in the past five presidential contests at this point except Republican Bob Dole, who lost in 1996. A 51 percent majority say Obama is too liberal, and Americans are inclined to say they disagree with him on the issues that matter most to them. On the positive side, 58 percent say he has the personality and leadership qualities a president should have.

The USA Today survey goes on to note that none of the Republican presidential candidates have connected with the electorate nor are they inspiring a dissatisfied, frustrated, dispirited nation.

But a challenger can improve. An incumbent is a known quantity.

Note this poll description says “Americans” and elsewhere in the article says “registered voters.” So how do the numbers look among likely voters?