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By summer of 2003, Howard Dean had become the apparent front runner for the Democratic nomination, performing strongly in most polls and leading the pack with the largest campaign war chest. Dean's strength as a fund raiser was attributed mainly to his embrace of the Internet for campaigning. The majority of his donations came from individual supporters, who became known as Deanites, or, more commonly, Deaniacs. Generally regarded as a pragmatic centrist during his time as governor, Dean emerged during his presidential campaign as a left-wing populist, denouncing the policies of the Bush administration (especially the 2003 invasion of Iraq) as well as fellow Democrats, who, in his view, failed to strongly oppose them. Senator Lieberman, a liberal on domestic issues but a hawk on the War on Terror, failed to gain traction with liberal Democratic primary voters.

Which of Bush's policies did Dean criticize most notably?
the 2003 invasion of Iraq