Marco Rubio has spent the week rolling out a series of endorsements from high-profile Republicans.

Former Massachusetts Gov. Mitt Romney held an event with Rubio on Monday, House Minority Whip Eric Cantor (Va.) came out for him on Tuesday, Vice President Dick Cheney released a statement of support on Thursday and on Friday former Sen. Rick Santorum (R-Pa.) got on the bandwagon.

Santorum on Rubio: "He's the only candidate in this race who can be trusted to go to Washington and stand up to the reckless tax-and-spenders that treat taxpayer dollars and the federal budget like toys."

The Rubio camp tells the Ballot Box there are more to come.

Former Florida Gov. Jeb Bush (R) and former House Speaker Newt Gingrich (R) are some notable absentees from Rubio's growing list of public backers.