Guess who has spent the most $/Delegate

[Likely Voter]

Edit: Guess who has spent the most/delegate (of the remaining four candidates)

...surprisingly it isn't Romney.


Ad spending for each candidate to date
(including their SuperPacs)

Romney: $47.3M   ($113K/delegate)
Gingrich: $11.7M   ($86k/delegate)
Santorum: $7.5M ($40k/delegate)
Paul: $6.4M ($189k/delegate)

Source: MSNBC: Daily Rundown

So Romney has spent about half the money and garnered about half the delegates. And once you factor in spending for candidates that dropped out, he has actually spent less than half, so maybe he has got his money's worth. That being said, Santorum is getting a bargain price for his delegates. Ron Paul is getting ripped off (but hey maybe those Ninja delegates will help him get a better deal).

[Likely Voter]

For the nitpickers I added (of the remaining four candidates)