Ambers has a judicious review of the president's political prospects as he launches his campaign. I'd note this:
Obama is performing at roughly the Bill Clinton level in the comparable time period on questions about which political agent Americans trust more to handle domestic problems. (See CNN/USA Today/Gallup Trends data.) … At this point in 1995, more than 4 in 10 Democrats wanted a primary challenger for Bill Clinton; fewer than 2 in 10 do for Obama.