Can Rubio's lean campaign keep up with Bush's behemoth?

LAS VEGAS (AP) — In the 2016 campaign for president, Jeb Bush and Marco Rubio are competing for the same set of donors who traditionally support Republican White House candidates.

But while Bush is a son and brother of former presidents and comes to the race with a sprawling network of experienced fundraisers, Rubio has none of those advantages.

As a result, his campaign and the super PAC that supports him collected less than a quarter of the $114 million the Bush team raised in the first six months of the year.

It's a distinction already playing out in TV advertising. Bush and his allies have begun a planned $50 million television advertising blitz.

Meanwhile, Rubio and the super PAC helping him have reserved ad space worth about half of that amount.