So counting only TV spending, what is Romney’s cost per vote? $10.43, which is nearly three times the $3.89 that Gingrich and his allies spent, more than three times the $3.33 from Paul and company and nearly five times the $2.14 for Santorum.

But campaign ads are an imperfect measure of a campaign’s total operation. If we look at how much the candidates have spent so far from their campaign accounts, we get another way of looking at the race. Through the most recent disclosure, the Romney campaign has spent $55 million to date. The Gingrich campaign has spent $16 million. The Paul campaign has spent $29 million. And the Santorum campaign has spent about $5 million.

So how much has the entire Romney campaign spent per vote received? $17.14, which is a lot more than the $2.54 that Santorum spent, or the $9.05 that Gingrich has spent, and topped only by the $31.55 that Paul spent.