CNN's Anderson Cooper noted that Beto O'Rourke, who announced his campaign for the Democratic presidential nomination on Thursday, has a lot of merchandise on his website, but not a lot about his political policy preferences.

Cooper was speaking to Joe Hagan of Vanity Fair, who was criticized for his fawning article on the candidate.

Hagan opined that O'Rourke had gained name recognition from unsuccessfully attempting to unseat Senator Ted Cruz (R-Texas), but that he needed to prove that he has substance to back up the popularity.

"It does seem like, he's sort of, for many people, they may know the name, uh, but there, it's kind of a blank slate in terms, maybe it's like a ror—like you can project your own ideas onto who he actually is," Cooper said.

"Yes," agreed Hagan.

"If you go to his campaign website, there's a lot of stuff for sale I noticed today, t-shirts, there's like a tote bag," Cooper added.

"There's really not anything there on policy positions," he continued. "Do, do, are his policy positions thought out?"

"Well I press him on a few of them," responded Hagan. "And I would say he has opinions about things, but you know the more you press him on things, the fuzzier he gets.

"Now the question is whether he'll develop those as he goes along," he concluded.

'Is he crazy or?'

President Donald Trump weighed in on the campaign announcement Thursday and mocked O'Rourke for waving his hands too much at a campaign stop.

"I said, is he crazy or is that just the way he acts?" the president said to reporters about the video. "So I've never seen hand movement, I watched him a little while this morning doing I assume it was kind of a news conference, and I've actually never seen anything quite like it!"

O'Rourke responded with a laugh and dismissed the criticism, saying that voters wanted politicians to rise above the "pettiness."

Here's the video of Cooper's comments: