Senators Hillary Rodham Clinton of New York and Barack Obama of Illinois are running roughly even nationally as the battle for the Democratic nomination heads into Tuesday’s big round of primaries and caucuses, while Sen John McCain of Arizona has jumped to a dominating lead over his remaining rivals in the Republican race, according to a new Washington Post-ABC News poll.

Two days before voters in 24 states go to their polling places, 47 per cent of likely Democratic voters said they back Clinton and 43 per cent said they support Obama, with neither candidate decisively benefiting from the departure of former Sen John Edwards of North Carolina from the race.

By contrast, McCain’s wins in primaries in South Carolina and Florida and the winnowing of the Republican field have had a dramatic result: The senator from Arizona is now the clear front-runner for his party’s nomination.

McCain leads former Massachusetts Gov. Mitt Romney 48 per cent to 24 per cent among probable GOP voters as he continues to rapidly consolidate support, particularly among moderates and liberals. Former Arkansas Gov Mike Huckabee runs third in the new poll with 16 per cent, and Rep Ron Paul of Texas is fourth at seven per cent.

The Democratic and Republican hopefuls have been furiously crisscrossing the country seeking out votes in advance of Super Tuesday. More primaries and caucuses are being held on February 5 than on any previous single day in a nominating contest; about half the delegates needed to secure each party’s nomination at are stake.

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