The following commentary comes from an independent investor or market observer as part of TheStreet's guest contributor program, which is separate from the company's news coverage.NEW YORK (TheStreet) -- In Mississippi and Alabama, Mitt Romney failed miserably to prove he can win in the South, but now Rick Santorum must prove he can win in a big northern state, where the economy, not social issues, trump. Illinois will prove a great test. In Alabama and Mississippi, Romney struck out with two principal divisions of the conservative movement -- Tea Party voters focused more on economic issues and Evangelicals more concerned with social issues. Follow TheStreet on Twitter and become a fan on Facebook. Among the third important conservative cohort -- more-educated, more-urban and higher-earning voters -- Romney did somewhat better, but their turnout was low indicating a pronounced lack of enthusiasm for his candidacy. To those voters, Romney sounds more reasonable and has a plan to liberate the economy and country from regulatory overreach, federal pending on steroids, and President Obama's constant cultivation of class and racial divisions -- but he appears unauthentic.