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Rick Santorum tells Jay Leno why Mitt Romney endorsement was "buried" (VIDEO)

The former Pennsylvania senator once called Mitt Romney the "worst Republican in the country."

Santorum drops outEnlarge
Surrounded by members of his family, Republican presidential candidate, former US Sen. Rick Santorum announces he will be suspending his campaign during a press conference at the Gettysburg Hotel on April 10, in Gettysburg, Pennsylvania. Santorum's 3-year-old daughter, Bella, became ill over the Easter holiday and poll numbers showed he was losing to Mitt Romney in his home state of Pennsylvania. (Jeff Swensen/Getty Images)

Former presidential candidate Rick Santorum explained to Jay Leno why he waited until late Monday night to endorse Mitt Romney in the 13th paragraph of an email to supporters.

In an appearance Tuesday on the "Tonight Show," the former Pennsylvania senator insisted he wanted his supporters to have the news first thing in the morning, the New York Daily News reported.

More from GlobalPost: Rick Santorum endorses Mitt Romney

Leno responded that he thought Santorum would have been in bed by 11 p.m. most nights.

"No, no. We have seven kids, so we don't sleep," a smiling Santorum said, outfitted in his signature sweater vest.

So why was the endorsment, "kind of buried," as Leno put it?

More from GlobalPost: Rick Santorum: 5 highlights of his campaign

Santorum said the message about him, not Romney, the Christian Science Monitor reported.

“This was a letter to my supporters -- who were for me -- to say, ‘Well, here’s now why I think we should rally around Mitt Romney and support him,’" Santorum said.

He added that he “has some concerns” which he wanted to discuss with Romney before formally endorsing him, ABC News reported.

“I voiced some of the things that I thought were important for us if we are going to be successful in this general election that he would take the cudgel and run with it,” Santorum said.

At one point during his campaign, Santorum called Romney the "worst Republican in the country" to put up against President Barack Obama. He told Leno he was speaking strictly about Obamacare, but trusted that Romney would work with Republicans in Congress to repeal it.

http://www.globalpost.com/dispatch/news/regions/americas/united-states/120509/rick-santorum-tells-jay-leno-why-mitt-romney-end