Obama, who is attempting to be the first African-American US president and is still ahead in the race by 1,705.5 delegates to Clinton's 1,575.5 with 37 delegates from Pennsylvania still to be awarded, said he was happy to narrow down her 20 point lead in the exit polls but targeted Clinton for her 'terror tactics' and backing by lobbyists.
Other major contests won by her include Ohio, California, New Jersey and Texas.
"You can't be the champion of working Americans, if you're funded by the lobbyists who drown out their voices," Obama said in Indiana, where the next major primary would take place on May 6 along with North Carolina.
Targeting Clinton for last-minute measures, including an ominous ad that featured images of Al Qaeda mastermind Osama bin Laden, Obama said: "We can be a party that thinks the only way to look tough on national security is to talk, and act, and vote like George Bush and John McCain. We can use fear as a tactic, and the threat of terrorism to scare up votes."
With only nine contests remaining till the August party convention, none of the candidates is expected the reach the magic figure of 2,025 needed to win the nomination for the November presidential election and it may go down to the 800 odd super delegates to choose the candidate.
Image: Hillary with her husband and former United States president Bill Clinton.
Photograph: Robyn Beck/AFP/Getty Images
Also read: Clinton, Obama pull no punches in debate
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