They have nothing in common besides being from Illinois. I find his comparison to Lincoln absolutely appalling and disrespectful to Lincoln.
If Obama understood history, I figure he would actually speak out against Honest Abe as he has against George W. Bush. First, the Emancipation Proclamation, an Executive Order, freed the slaves (would Barack consider that an abuse of power?). Second, Lincoln suspended the right of habeas corpus during the war. Third, he instituted a draft, which many considered unconstitutional. Also, if you had $300, you would avoid the draft.
What was the end result of all those? The United States of America won the Civil War and was on its way to be the great nation that it is today. Barack is using his vision of the ends, but not the means, when trying to compare himself to Lincoln.