The poll showed support for Sanders at 48 percent in the state, while Clinton stood at 46 percent.
This is the first CBS/YouGov poll conducted in the state, and the first to show the socialist insurgent overtaking the Democratic frontrunner there. But it is consistent with recent polling, which has shown the race tightening in Illinois following Sanders’ upset victory in Michigan. Most polls show Clinton remaining ahead, however. She clocks double-digit leads in Florida.
TPM’s PollTracker Average shows Clinton up by a hair in the state, at 47.7 percent to Sanders’ 47 percent.
The CBS/YouGov poll was carried out from March 9-11 by internet survey. Pollsters surveyed 722 people likely to vote in the Democratic primary, with a margin of error of 5.5 percentage points.