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Mike Schrimpf, spokesman for the Republican Governors Association, called Mr. O’Malley’s comment “pretty ironic,” given Maryland’s 7 percent unemployment rate, compared with 5.9 percent for neighboring Virginia.

“I think the frustration for Gov. O’Malley is his big-government approach isn’t working, so the only thing he knows how to do is attack,” Mr. Schrimpf said.

Another Democrat, former Michigan Gov. Jennifer Granholm, sent out a tweet Sunday saying, “R convention delay due to Isaac: I guess God has ways to shut that whole thing down.”