Even Democrats realize that spooky ads on immigration policy are effective, particularly in a fight to defeat Senate Republican Candidate Mike Rounds in South Dakota.

A new DSCC ad raises questions about a Chinese loan to a meat packing plant in South Dakota, accusing the company of selling citizenships to wealthy Chinese investors.

EB-5, however, is a federal program allowing some foreign investors to earn green cards for investing $500,000 in the United States.

South Dakota Democrats have moved quickly on the attack — honing in on a key weakness for Rounds.

In September, Sen. Tim Johnson sent a letter to the Government Accountability Office to investigate the program.

David Montgomery at the Argus Leader explains Rounds’ role in the loan — and his defense.