Democratic presidential front-runner Hillary Clinton on Monday said enacting tighter firearms regulations requires overwhelming voter support, given the strength of gun lobbyists.

“Nothing is more powerful than the gun lobby,” she told host Chris Matthews during an MSNBC town hall in Springfield, Ill. “This is an issue I am so profoundly disturbed about. We have to take on the gun lobby. The gun lobby really intimidates elected officials. We have got to make this a voting issue.”

{mosads}Clinton was addressing a questioner who wondered how she would prevent mass shootings like the one that killed 20 children and six adult staff members at Sandy Hook Elementary School in Newtown, Conn., four years ago.

She said on Monday evening that witnessing evidence of Chicago’s gun violence epidemic firsthand earlier that day had strengthened her resolve on the issue.

“Today in Chicago I visited a wall with bricks with the names of young people who have been murdered in the last seven years,” she said, citing the city’s gun deaths. “We need comprehensive background checks. We need to end the immunity from liability [for gun manufacturers].”

Clinton’s remarks come the day before Illinois’s Democratic presidential primary and four other voting contests nationwide.

Sen. Bernie Sanders (I-Vt.), Clinton’s sole remaining rival for the Democratic presidential nomination, is leading in Missouri and is within range of Clinton’s leads in Illinois and Ohio.

Clinton has frequently portrayed the Vermont lawmaker as soft on gun control during their struggle for the Democratic presidential mantle.

She has won 14 voting contests before Tuesday’s events, contrasted with Sanders’s nine, and she also leads the self-described democratic socialist in delegates claimed.