BACK IN THE RACE: Analysts said it was critical that Hillary Clinton won Ohio.
Democratic White House hopeful Hillary Clinton has scored a huge boost in her campaign, winning the popular vote in the Texas primary after taking Ohio and Rhode Island, US media reports.
The wins for Clinton, 60, a New York senator, will send the hotly contested Democratic race on toward the next major contest - Pennsylvania on April 22.
Today's wins break Barack Obama's month-long string of victories in the state contests to pick a Democratic candidate for the November US election.
It is a major comeback for Clinton, who was under pressure to win in the two biggest states, Ohio and Texas, or face calls to withdraw from the race.
"We're going on, we're going strong, and we're going all the way," Clinton told roaring supporters in Columbus, Ohio. "We're just getting started."
Earlier, Clinton won the Rhode Island presidential primaries, while Obama picked up an easy win in Vermont.
Turnout was reported heavy in all four states, and the Obama and Clinton campaigns traded accusations of irregularities at the polls in both Ohio and Texas.