A spokesman for Sittenfeld, a Cincinnati city councilman, said Bob Diamond did not participate in the event.
Jennifer Diamond has also contributed to Sen. Kirsten Gillibrand, D-N.Y., President Barack Obama, Sen. Claire McCaskill, D-Mo., and Sen. John McCain, R-Ariz., according to the Center for Responsive Politics.
Some Democrats urged Sittenfeld, 30, to get out of the 2016 Senate race after former Ohio Gov. Ted Strickland announced he is running. The seat is held by Republican Rob Portman, who is running for re-election.
- Reported by Jessica Wehrman, Jack Torry and Tina Nazarian in our Washington Bureau
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