Forty-two percent believe news reports exaggerate the seriousness, the polling firm found.
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The first lady and her daughters plan to do some sightseeing during a weeklong visit.
Nearly 97 percent of Crimeans voted to secede from Ukraine, reports said.
“We are recalibrating and assessing our strategy,” press secretary Jay Carney said.
“I’m not going to get into a game of hinting or indicating who might be next,” an aide said.
After serving an eight-year racketeering sentence, the La. Democrat is back in politics.
Rep. Ileana Ros-Lehtinen (R-Fla.) said the quake made her "twist and shout."
The senator said he didn't know how Obama's response "could have been any weaker."
He said the United States stands ready to impose further punishment in the days ahead.
The GOP senator said Russian President Vladimir Putin only understands "strength and power."