That might be a pretty good bet.
MCCAIN CAMPAIGN DONATIONS
https://www.opensecrets.org/politicians/summary.php?cid=N00006424
Individual Contributions $9,526,142 (64%)
- Small Individual Contributions $952,941 (6%)
- Large Individual Contributions $8,573,196 (58%)
PAC Contributions $2,363,462 (16%)
Candidate self-financing $0 (0%)
Other $2,906,823 (20%)