Marco Rubio in The Huffington Post

On Abortion: Consensus that life begins at conception; so no abortion

The debate, however, isn't nearly as clear-cut as Rubio claims. So-called personhood bills have sparked debate on when a fetus should be considered an individual with full legal rights.

On Drugs: Enforce federal law even in states with legal pot

Rubio, however, has previously left the door open on medical pot, which will come up for a vote in his home state this November. "You hear compelling stories of people who say the use of medical marijuana provides relief for the thing they are suffering," Rubio said in a January interview. "So I'd like to learn more about that aspect of it, the science of it."

On Drugs: No responsible way to recreationally use marijuana

In an interview, Rubio was asked whether he had ever smoked pot: "Here's the problem with that question in American politics: If you say that you did and suddenly there are people out there saying 'Well, it's not a big deal. Look at all these successful people who did it,'" Rubio said. "I don't want my kids to smoke marijuana. And I don't want other people's kids to smoke marijuana. I don't believe there's a responsible way to recreationally use marijuana."

He continued: "On the other side of it, if you tell people you didn't they won't believe you. The bottom line is, I don't think people should smoke marijuana." The senator has previously dodged the pot question, saying his own experience is "irrelevant" to drug policy.

On Energy & Oil: Climate is always changing; it's not from human activity

After receiving backlash for his remarks, Rubio sought in another interview to clarify his position: "I've never disputed that the climate is changing, and I've pointed out that climate to some extent is always changing, it's never static," Rubio said. "There are things that we can do to become more efficient in our use of energies, there are things we can do to develop alternative sources of energy."

Rubio defended those remarks during a third interview: "I think the scientific certainty that some claimed isn't necessarily there," he said.

On Health Care: All kids should get vaccinated, with medical exceptions

Several Republicans also have voiced support for vaccinations. "Unless they are immune-suppressed for medical exceptions, but I believe all children should be vaccinated," Sen. Marco Rubio (R-FL) said. "Absolutely, all children in America should be vaccinated."

House Speaker John Boehner (R-OH) said all children should be vaccinated, and didn't know if another law was required.

Gov. Chris Christie (R-NJ) helped fuel the controversy this week, saying parents should "have some measure of choice" in vaccinating their children.