Cardiologist Rob Steele is considering a bid for the open Senate seat in Michigan in 2014, according to a local source with direct knowledge of his interest. Steele is best-known among Republicans for his 2010 bid against longtime Rep. John D. Dingell, D-Mich. During that campaign, Steele picked up former Alaska Republican Gov. Sarah Palin’s endorsement and gave national Democrats a brief scare that Dingell could lose his safe Democratic seat. Steele lost by 17 points.