Petition campaigns have begun for groups wanting the limit interest rates on payday loans and for increasing the state minimum wage. The groups behind the efforts have held a joint kickoff event in Columbia. One group wants to limit payday loan rates to 36 percent. The other wants to hike the state minimum wage to $8.25 an hour. They’re shooting for a November election. Each group needs to get $105,000 valid signatures in six of the nine congressional districts.