Hillary Clinton won primaries in Florida, North Carolina and Ohio, the night’s most contested prize, as her rival, Sen. Bernie Sanders, struggled to get the boost he needed to try to close the gap in the race for the Democratic presidential nomination.

Clinton also won a close contest in Illinois and was holding an extremely small margin in Missouri, with nearly all of the votes counted. With those contests so close, neither candidate will gain a significant edge from them in the race for delegates to the Democratic nominating convention this summer. Clinton’s three big victories, by contrast, will give her a major gain.