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Nathaniel Exum

Incumbent losses deepen Senate divide

The ouster of a half-dozen state Senate incumbents in this week's primary elections is likely to deepen the partisan divide in Annapolis, analysts said, nudging the Democratic majority to the left and the Republican minority to the right.

On the Democratic side, Local 1199 of the progressive Service Employees International Union helped to replace four incumbent senators, including George Della of Baltimore, with challengers seen as more liberal. On the Republican side, conservatives cheered the election of conservative House Minority Whip Christopher Shank of Washington County over moderate Sen. Don Munson.

"It is a swing around to some extent," said Democratic...