Clinton leads Trump, 45 to 38 percent.
Clinton makes history as first woman presidential nominee
Duckworth is running to unseat incumbent Sen. Mark Kirk (R-Ill.).
The measures would exempt feminine hygiene products from sales taxes.
Sen. Mark Kirk said he is the "best-positioned Republican" to avoid being linked to Trump.
Ron Johnson and Mark Kirk targeted their election opponents.
The surging Sanders had made the state a toss-up in recent days.
Ohio, Missouri and Illinois all look like toss-ups in the Democratic race.
While violence marked a canceled Trump rally, Sanders was singing elsewhere in the state.
Rep. Luis Gutierrez (D-Ill.) is helping orchestrate the demonstration on Friday.
The Supreme Court's decision could be an issue in several races.
"The candidate is a natural born citizen," the board said.
Chicago is largely responsible for an increase in the U.S. murder rate, says a new report.
A cash-strapped Illinois health insurer won’t be sending ObamaCare payments to Washington until the...
Duckworth also posted a link to a website comparing Kirk's and Trump's rhetoric.
In a state that goes blue in presidential years, Kirk's seat will be tough to hold.
In an Illinois congressional race, positions on the Iran nuclear deal have come to the forefront.
The progressive group is throwing its weight behind potentially decisive Senate races.
The win in Illinois adds to the GOP front-runner's momentum.
Clinton and Sanders are battling on the eve of the Illinois primary.
Protesters flocked the area outside of Trump's event in Chicago.
The lawsuit challenged Cruz's eligibility because he was born in Canada.
Watch live as President Obama speaks to the Illinois General Assembly.
Andrea Zopp hopes to defeat Rep. Tammy Duckworth (D) in the Senate primary.