(CNN) - Three days after Hillary Clinton's win in Pennsylvania, a new poll suggests it’s a dead heat in Indiana - the next crucial battleground that could decide the Democratic presidential nomination.
Barack Obama leads Clinton by 1 point in the Hoosier State, according to a just-released poll conducted by Research 2000, 48 percent to 47 percent. Given the polls' 5 point margin of error, the two candidates are statistically tied.
The poll also shows both candidates are holding strong with constituencies that have backed them in other states: Clinton easily wins among seniors and women, Obama has the advantage with young voters.
Indiana has been called a 'must win' for Clinton, even by some of her strongest supporters. On CNN's Larry King Live Wednesday, Clinton backer James Carville said the May 6 voting state could serve as a "tie breaker."
"I think it's going to be very difficult for Senator Clinton if she loses both in Indiana and North Carolina," he said. "I think she has to keep pressing the bet, doubling down."
"If she wins in Indiana, it's going to cause some people to turn up and look around," he said. "I think it's a very important contest."