Who knew that looking good could be a disadvantage? At least that's according to top dog Republican Bob Vander Plaats when he announced that he will not give his support to Sen. Marco Rubio because of his "boyish good looks."

According to an interview by Latino Fox News, Vander Plaats said that the main driving force he chose Texas senator Ted Cruz over Rubio was because of his youthful appearance. Vander Plaats is noted to be one of the most influential Iowan politician, whose endorsement is seen as essential to every candidate aiming to win the state.

Regarding his endorsement of Cruz over Rubio he said that, "It wasn't an easy choice, there's a lot I like about Marco. It was coming down to two people -- not Trump and Cruz, but Cruz and Rubio."

But he did offer high praise to the Florida senator and said that he's a man of high character and calling him a "principled conservative." Speaking about Cruz, the current leader in the Iowa polls, Vander Plaats called the senator as very bright and praised his record as the Texas Attorney general, the way he tackled Democrats and Republicans and his arguments before the U.S. Supreme Court.

According to him, since the situation of choosing between Cruz and Rubio was a tough one, he said that he consulted other conservatives that he respected and asked for their opinion, but the consensus remained the same -- they could not see the 44-year-old senator as president, Who Runs Gov reported.

Vander Plaats defended his position and said that although he, along with other Republicans, liked Rubio a lot, they just could not see him as a viable president because he looks like 19-years-old and jokied that Rubio may still get even carded when buying liquor.

Although the criticism about Rubio's youthful looks is a little bit unfair, he said that looking like the part you are aiming for is still very important. For him, people have to be able to see you as president, something that he just can't see with Rubio.

Cal Jilson, a political science professor at Southern Methodist University weighed in on the matter and said that most Republican candidates are almost stereotyped as old white men, and cited examples as Ronald Reagan, George H.W. Bush and even recent candidates like John McCain and Mitt Romney.

For Rubio, Jilson said that the Florida senator's looks is seen as someone who's inexperienced, but already trying to jump on the presidential race.

In Rubio's defense, he did not shy away from capitalizing on it and using his youthful appearance on his campaigns.

Over the course of his campaign, he has portrayed himself as one of the new batch of conservative Republicans that will bring fresh ideas on the table.

As for Vander Plaats' comments, the Rubio camp declined to comment on the matter.