Sen. Mark Kirk is leading Rep. Tammy Duckworth by a slim margin in his bid for reelection, while presumptive Democratic presidential nominee Hillary Clinton holds a large lead in Illinois, a new poll suggests.
The survey was conducted by Basswood Research on July 11-12, Crain's Chicago Business reports. Kirk leads Duckworth 41.9 percent to 40.4 percent, a change from the firm's April poll that showed Duckworth leading Kirk 42.5 percent to 42 percent.
The new poll, which includes a 3.5 percent margin of error, reaffirms that Kirk and Duckworth are locked in one of the nation's most hotly-contested Senate races.
This summer, Kirk ran TV ads in the Chicagoland area before Duckworth. This could explain the slight shift in poll results. Since the April poll, Kirk also pulled his tacit endorsement of Republican presidential nominee Donald Trump.
Basswood, a Kirk-allied group, has worked for pro-Republican political action committees like Club for Growth and Senate Conservatives Fund in the past.
The poll also shows that Clinton has opened up a big lead in her home state, leading Republican presidential nominee Donald Trump 46.4 percent to 32.5 percent in Illinois.
According to the poll, Libertarian Gary Johnson received 5.2 percent of the vote and the Green Party’s Jill Stein received 2.6 percent, while 13 percent of respondents remained undecided.
The report also showed that Kirk performed 22 points better than Trump with moderates and 24 points better with women.
Additionally, Basswood’s survey found that a majority of Illinois voters oppose the Iran nuclear deal, favor keeping the Guantanamo prison open and oppose accepting Syrian refugees.