The non-profit, non-partisan Virginia Public Access Project keep tabs on the donations. The group reports 57 checks totaling $10,000 or more were donated to McDonnell's political action committee (PAC), Opportunity Virginia.
That accounts for approximately $1.4 million of the $1.53 million in contributions accepted between April and June.
Most of the money is expected to buoy state GOP candidates looking to tip the slim 22-18 majority held by Democrats in the state senate.
David Poole, executive director of the Virginia Access Project, says large donations such as these are not unusual.
Virginia is one of a handful of states with no limits," Poole says. "Anyone can give in any amount to a candidate. Virginia is a disclosure state that relies on the public to get access to the information and make their own judgments on whether candidates are unduly influenced by campaign contributions, so transparency in tremendously important."
State law requires any PAC that raises money in Virginia to report donations of $10,000 or more within three business days.