Item: Romney pads lead; Santorum still in it: Delegate front-runner picks up key Ohio victory/David Espo, AP

More Info: On the busiest night of the campaign, Romney scored a home-state win in Massachusetts to go with primary victories in Vermont and in Virginia – where neither Santorum nor Newt Gingrich was on the ballot. He added the Idaho caucuses to his column. ... Santorum countered crisply, winning primaries in Oklahoma and Tennessee and the North Dakota caucuses – raising fresh doubts about Romney’s ability to corral the votes of conservatives in some of the most Republican states in the country.

Question: Time for Ron Paul and Newt Gingrich to head to the sidelines and let Romney and Santorum fight it out?

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