DOVER, Del. - When a Delaware radio station asked Newt Gingrich if he would take a cabinet position in a Mitt Romney administration, he  said "probably not," citing personal reasons.

"Not because I am opposed to Mitt. Look, if the choice does end up being Romney versus Obama, I can be very, very enthusiastic for Romney. That is a huge choice. But I had a very good life doing a lot of fun things. I'm a grandfather. I've got two grandchildren I want to spend time with," Gingrich said.

Gingrich said he would be willing to advise a RomneyWhite House from afar. "I am very happy to be an adviser. I did a lot of that in the Bush administration, both on health care and national security, and I put in thousands of hours just offering strategic advice and looking at specific programs." 

The former House speaker, who has vowed to stay in the race all the way to the Republican convention,  said his strategy over the next several weeks would be to get Romney to talk more about his policy planks so the voters left in the remaining primary states could see the contrast between Romney and Obama.

"I would like to give people the chance to see these are the two major alternatives to Obama, and which one is the better alternative," Gingrich said.