My first clue that tipped me off was on the actual census page (Springfield Illinois 1850) there is a large arrow pointing to Abram Lincoln's line. Secondly, I looked up a website that would help me corroborate my theory. You can view it for yourself: http://www.historyplace.com/lincoln/
The Census page can be seen by clicking on this link: http://www.ancestry.com/s14209/t5497/rd.ashx?dbid=8054&iid=ILM432_127email@example.com&from=AaronBryan&ancestor=yourancestor&emd=12b08e1458987508a171dec7d97a6e3ca0deadbeefc0debad
So, I verified that he was married by this time to Mary, and also that he has a son (Robert) at this time, and that he is living in Springfield Illinois at this time frame. Although he had lived in a boarding home in Washington DC, he moved his family to Illinois to start his own law office and go around the 8th Circuit to 14 different counties in Illinois. The census shows that he is in fact an attorney at law. Yes, this is the Abraham Lincoln who would become the 16th President of the United States. The picture on the right shows Lincoln around 1846.
It is amazing the things you come across doing a little digging around...