Paul brings in 16 percent of the vote among Republicans and Republican-leaning independents.
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Kerry told Russian counterpart the U.S. will not recognize results of Sunday's vote.
Perry said Kentucky race and midterms are "inextricably intertwined" with country's future.
“That will not happen,” Senior Adviser Dan Pfeiffer said.
“This is a Soviet-style election. We know what the end is going to be,” Durbin said.
He said Rep. David Jolly's (R-Fla.) win in Florida's special congressional election is proof.
“Putin only understands strength,” Sen. Robert Menendez said.
"I think this all leads toward the cockpit,” the Texas Republican said.
McCain and others asked for the U.S. to provide military equipment to Ukrainian troops.