Senator Tom Harkin used a speech to Iowa Democrats this evening to argue for President Obama’s reelection. But Harkin also used humor — with a Halloween theme — to suggest Republicans offer a “scary” agenda for the country.

“Paul Ryan is Eddie Munster. Mitt Romney is Freddy Krueger, slashing Big Bird and Planned Parenthood. Steve King dressed up as,” Harkin paused for effect, before adding, “Steve King.”

The crowd laughed at Harkin’s jokes about Romney and Ryan, but they laughed and cheered Harkin’s blast at Steve King, the Republican congressman from northwest Iowa.

AUDIO of Harkin’s speech.

Harkin joined three of the four Democratic congressional candidates this evening in addressing their party’s annual Jefferson-Jackson Day Dinner. The keynote speaker was Los Angeles Mayor Antonio Villaraigosa.

Shawn McCoy, a spokesman for Romney’s Iowa campaign, issued a written statement.

“President Obama and his campaign won’t discuss his second-term agenda,” McCoy said. “…Mitt Romney will deliver a real recovery for struggling Americans.”

Paul Ryan is scheduled to campaign in Council Bluffs at noon on Sunday. He’ll appear later in the afternoon in Sioux City. President Obama is scheduled to visit the Quad Cities on Wednesday.

Radio Iowa