The race for the Democratic nomination, once seen as a sure thing for Clinton, took on new energy this week after Sanders held the former secretary of state to a razor-thin margin of victory in Iowa's leadoff caucuses.
Their comments have become increasingly sharp this week, and the candidates agreed to add four more debates to the primary season schedule, including today's in New Hampshire.
The candidates are arguing over who is more committed to, and capable of, carrying out a liberal agenda on health care, income inequality, worker rights and more.
Sanders, a senator from neighboring Vermont, said yesterday that Clinton's record is "just not progressive," including her vote as a senator to authorize the war in Iraq. Clinton said she has the ability to actually implement progressive changes.
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"Good ideas on paper are important, but you've got to be able to translate them into action," she said.
Sanders cast himself as an underdog going up against "the most powerful political organization in the country." He says it will take a "political revolution" to achieve goals such as universal health care, a fairer tax system and an incorruptible campaign finance system.
Today's debate will be the first faceoff for Clinton and Sanders since former Maryland Gov. Martin O'Malley dropped out of the race after a poor showing in Iowa on Monday.
Clinton's razor-thin win in Iowa was the latest twist in an election campaign that, until recently, had been overtaken by the unusually crowded Republican field.
Its candidates, who are scheduled to meet again in a debate Saturday, took New Hampshire by storm ahead of the primary.