It cost Mitt Romney $18.50 per vote and $126,000 per delegate to win the GOP nomination this year.

CNN looks at the spending numbers and finds Rick Santorum and Newt Gingrich spent their money a little more wisely, while Ron Paul had worse numbers.

Gingrich spent $10 per vote and $150,000 per delegate, while Santorum spent $6.50 per vote and $71,000 per delegate.

Ron Paul forked out $32.40 per vote and nearly half-a-million per delegate.

Those numbers don't include spending by outside super PAC's.

When super PAC money is factored in, overall spending on Romney's behalf jumps to $122 million, bringing his cost-per-vote to just under $30. By this measure, each delegate cost more than $200,000.

Gingrich also saw a significant jump when super PAC money is included. Adding in the $18 million spent by the Winning our Future super PAC, the former House speaker's cost-per-vote jumps to over $17.75, while spending per delegate tops $275,000.

The Santorum super PAC added around $8 million in spending. That pushed him to almost $9.50 per vote and $101,500 per delegate. Less reliant on super PAC spending, Paul's figures were little changed.