(CNN) – John McCain and Barack Obama swept the “Potomac primaries” – Tuesday’s contests in Virginia, Maryland, and Washington, D.C. – as the march to the Republican and Democratic nominating conventions continues.

In the latest episode of CNN=Politics Daily, Senior Political Analyst Bill Schneider takes a look at exit polling data from Tuesday’s votes.

Even before Obama’s sweep of the region’s primaries, Hillary Clinton had already taken steps to shake up her campaign. John Roberts speaks with former Clinton aide Lisa Caputo about the next phase of the former first lady’s campaign. And GOP long shot Mike Huckabee explains why he’s staying the race.

Finally, Chief National Correspondent John King breaks down the voting patterns in Tuesday’s contests, and takes a look at whether Huckabee can still win enough delegates in the remaining primaries to capture the Republican nomination.

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–CNN Associate Producer Martina Stewart