I started thinking last night about who was the most popular president today - as oppposed to which president was most popular during his time in office - so I ran a couple of senerios through Google Tracker. (Google Tracker let you compare how often different terms are searched for on google.com)
I started out comparing in big name presidents prior to 1877 - Washington, Jefferson, Madison, Jackson, and Lincoln. Little surprise that Washington was at the top. Lincoln usually second, although Jefferson did surge ahead at a few times during the last couple of years. Jackson stayed pretty much at the bottom.
The most popular presidential searches on google.com for presidents prior to 1877.