What did she see?

Not sure what it was exactly, what was the clown, the Joker Card? I didn't catch it fast enough. The politician was supposed to the Devil Card... haha

All I know is Maureen has the weirdest scream I've ever heard ....

"When you have insomnia, you're never really asleep... and you're never really awake."

It's the politician, Senator Max McIver.

Pick-Up is quite tight on it's plot, in the sense that what there is of it, is quite succinct, so most characters and scenes we see are there for good reason.
In this instance the clown scene follows directly on from Maureen's previous scene with him.

To indicate this to the viewer, the clowns mask is painted red, white and blue like the politicians hat band, and when the mask is taken off we can briefly see the politician's grey sideburns and hairstyle.
The politician himself you can see has a pale white make-up on, and his mouth has a clown's painted red smile, his eyes are deliberately reddened too to give that odd surreal look to him.
Also, they are the same diminutive height.

The symbolism of conflating them together is fairly clear in these two sequences -
Two-faced politicians hiding behind a happy mask, the archetypal scary duplicitous clown, the politicians selling dreams like the clowns balloons that simply float away.

We see them both again during the altar scene with Chuck and Maureen, lurking around and trying to intrude upon and corrupt their open intimacy and purity, shown with the white robes and laurel wreaths, and it almost works, but ultimately fails.