Former Pennsylvania senator Rick Santorum, left, failed to submit a sufficient number of signatures in one of Indiana's nine districts. The co-chairman of former Massachusetts governor Mitt Romney's presidential campaign in the Hoosier State will be one of the officials who has to decide whether Mr. Santorum's name should remain on the ballot. Photo: Paul Sancya / AP.
Four Indiana voters decided on Monday to challenge Republican presidential candidate Rick Santorum‘s status for the state’s primary, which is due to be held on May 8. Although the former Pennsylvania senator filed over 4,500 signatures in total, he only provided 492 valid signatures from registered voters in the state’s 7th district.