Boo! Happy Halloween – the holiday where young pranksters don ghoulish costumes and try to scare their neighbors.

So which presidential candidate would you be most scared to see tonight?

When asked which candidate would make the scariest costume, 37 percent of Americans picked Democrat Hillary Clinton, according to an Associate Press-Ipsos poll. Republican Rudy Giuliani came in second to Clinton in this poll, with 14 percent.

Not too surprisingly, two-thirds of Republicans said Clinton would be the scariest. But so did 18 percent of Democrats. A greater number of Democrats voted Giuliani the scariest. One-third of independents also picked Clinton.

Thinking of dressing up as Democratic candidate Chris Dodd? His Web site will tell you what to wear. They suggest you wear white hair and a passion for service and carry a copy of the Constitution and Dodd campaign literature.

Some candidates have been trying to link the holiday to their campaign themes. Republican candidate Mitt Romney gave a speech about “Hillary’s House of Horrors” in which he described her candidacy as if it were a haunted house: “You go in one room, she wants to raise your taxes. You go in another room and she wants to have government taking over health care,” he said in a town hall meeting in Florida.

In the October 30 Democratic debate, Illinois Senator Barack Obama said he was considering wearing a Mitt Romney mask for Halloween which “has two sides to it. It goes in both directions at once.”

Read here for more about Halloween in the United States.