Hillary Rodham Clinton said emphatically Wednesday night that Barack Obama can win the White House this fall, undercutting her efforts to deny him the Democratic presidential nomination by suggesting he would lead the party to defeat.

“Yes, yes, yes,” she said when pressed about Obama’s electability during a campaign debate six days before the Pennsylvania primary.

Asked a similar question about Clinton, Obama said “Absolutely and I’ve said so before” _ a not-so-subtle dig at his rival who had previously declined to make a similar statement about him.

In a 90-minute debate, both rivals pledged not to raise taxes on individuals making less than $200,000, and said they would respond forcefully if Iran obtains nuclear weapons and uses them against Israel.

“An attack on Israel would incur massive retaliation by the United States,” said Clinton.

Obama said, “The U.S. would take appropriate action.”