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Claire McCaskill Says Conway's Tactics 'Close To The Line' (VIDEO)

Newscom / Derik Holtmann

McCaskill suggested that behavior was over the top.

"With all due respect I can pull up lots of negative ads the Republicans have run that you would be just as outraged over," McCaskill told the panel on MSNBC's Morning Joe this morning.

McCaskill also called Paul "out there" and "an extreme candidate" while praising Conway as "very common sense and very moderate."

On a conference call with reporters today, Conway spokesperson John Collins defended the ad and the Baylor messaging against criticisms like McCaskill's.

"The focus is for Rand Paul to come forward and explain his actions," Collins said. "Remember, this is an ad about things he did -- he has failed to deny any of these charges. Instead, he lashes out and huffs and puffs and storms off the stage."

Watch McCaskill on MSNBC (video clipped by the NRSC):

The TPM Poll Average shows Paul leading Conway 46.9-41.7.