US presidential hopefuls waged verbal wars against each other Thursday on economic policy.

Democratic Sens. Hillary Clinton (D-NY) and Barack Obama (D-ILL.) laid out their proposals to reinvigorate the economy as they attacked the plan advocated by Republican presumptive nominee Sen. John McCain of Arizona as "ineffective".

Democratic presidential candidate Senator Hillary Clinton delivers a campaign speech on the war in Iraq at George Washington University in Washington, March 17, 2008. (Xinhua/Reuters File Photo) 

Clinton's campaign also attacked Obama's economic address as "just words" and accused him of copying her plan.

The former first lady said McCain's plan "does virtually nothing to ease the credit crisis or the housing crisis".