Lincoln comes in second. Third? Bill Clinton!
Obama is 7th, with 5%.
There's a partisan quality to the numbers. If you look at Republicans, it's Reagan, Washington, Lincoln. Democrats' top 3 is: Clinton, Kennedy, Obama. (FDR and Lincoln tie for 4th.) Independents put Lincoln first (and then Reagan, then Clinton). Actually, I think the main thing going on here is people are being asked to come up with the name of a President, and they don't have that many names floating around in their heads. It's always safe to say "Lincoln." Beyond that, they're rooting around in the decades they remember personally.
AND: Set your DVR. It's the big Chris Matthews special, "President of the World: The Bill Clinton Phenomenon": "Bill Clinton's position in the world continues to grow. He's part dignitary, part humanitarian, part politician, part international statesman, and somehow, greater than them all..." Sounds like the old Matthewsian leg is all a-tingle.