Tough Hurdles Await Marco Rubio on Way to White House

Former Florida Gov. Jeb Bush may be one of Rubio's largest hurdles, given that he has an overwhelming financial advantage and would be competing for the same Florida supporters as the senator.

Rubio also lacks a long track record of experience, having been elected to the Senate in 2010. While he has some appeal as a fresh face there is also skepticism about first-term senators running for president in the aftermath of President Barack Obama's rise to power.

"Rubio will have to answer the criticism from the governors — with...