This isn't a big surprise that Rubio is a front runner for the Republican nomination. He has offered the very wealthy the promise of virtually no taxes on unearned income, the income earned not from working but from having money. The kind of investing in paper, money like things, investing that makes the rich richer without improving the real economy that supports most of people in the nation.
He also promises to give the wage earning conservatives what they apparently want, higher taxes for them, higher government debt, lower social security benefits, lower wages, a longer workweek with fewer holidays, an end to overtime pay, fewer people who have healthcare insurance, a political home for their racism and other bigotries, protection for their guns and for the people who commit crimes using them, periodic financial crises from poorly regulated financial markets like we had in 2008, protection for their ignorance especially when science threatens it, a return to the gold standard to bring on the worst situation for capitalism- deflation, wars instead of diplomacy that results in a bad deal, etcetera.