The poll conducted for WEEK TV and the (Bloomington) Pantagraph newspaper found that 69 percent of those polled support Obama. Keyes, meanwhile, got the support of 24 percent of the 600 likely voters surveyed in the random telephone poll.
Those results mirror several other surveys that all show Obama with a commanding lead.
Keyes got a late start in the race after he stepped in when primary winner Jack Ryan left amid a sex scandal.
The poll found that only 21 percent of those surveyed had a favorable opinion of Keyes. In contrast, 65 percent had a favorable opinion of Obama.
The poll has an error margin of four percentage points.