Still unknown is whether the White House will renew a call for expanded background checks.
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The pontiff topped Sen. Ted Cruz, who was number five on Time magazine's list.
Kerry said the people of Ukraine "deserve better."
“The launch of HealthCare.gov was flawed and simply unacceptable,” Sebelius said.
A majority in new poll also rated the 113th Congress as one of the worst ever.
Approval of ObamaCare has risen eight percentage points in the last month.
Obama's approval rating is up four points in a new Pew poll.
"What we really need is a government with less debt," the Florida senator said.
The lawmakers write in a letter that ObamaCare is not the "only way to reform health care."
"Can imagine what Nelson Mandela would say," Leahy tweeted.