Is Jeb Bush's TV ad campaign the least effective in presidential history?

It’s maybe too early to completely write off Jeb Bush’s struggling presidential campaign.

But it isn’t too early to declare that the $35 million – and counting – that Bush and his allies have spent in TV ads since September might go down as the least effective advertising campaign in presidential history.

Consider: Despite that more than $35 million, spent mostly by the pro-Bush Super PAC Right to Rise, Bush’s national poll numbers remain stuck in the single digits, with a recent national Monmouth poll showing him at just 3 percent.

What’s more, Bush and his allies have spent a whopping $17 million in New Hampshire alone, but Bush is just in single digits there.

And they’ve spent $9 million in Iowa, yet Bush’s favorable/unfavorable rating is upside down among GOP caucus-goers, according to the Des Moines Register/Bloomberg poll.