McConnell and ALG in "dead heat" in latest poll?

If she lost all this ground per the article, how is it still a dead heat??? This poll defies logic.
=========================

http://www.kentucky.com/2014/10/20/3491602_bluegrass-poll-mcconnell-takes.html?sp=/99/322/&rh=1

<snip>
Support for Grimes dipped most dramatically among self-identified independents, voters under 50 and voters in north-central Kentucky, a region that includes the Lexington area and Northern Kentucky.

Among independents, which made up only 14 percent of the likely voters surveyed, McConnell holds a three-point advantage over Grimes. Less than three weeks ago, Grimes held a 13-point lead among independents.

<snip>
Among voters under 50, which made up 46 percent of the likely voters surveyed, Grimes holds a one-point lead over McConnell, down from a nine-point lead earlier this month.

McConnell pulled even with Grimes in north-central Kentucky, a region she had led by seven points in the last poll. Likely voters in that region made up 33 percent of those surveyed.