The withdrawal of Charlie Crist, Florida's moderate governor, from the Republican primary has left the way clear for conservative favourite Marco Rubio to claim the party's nomination. Hailed as the first member of the Tea Party to have the potential to break into the Senate, Rubio has risen from political obscurity a year ago to poster boy for the Right-wing populist movement that has spread across the country in reaction to President Barack Obama's liberal agenda. A lawyer and former speaker of the house in Florida's legislature, he has vowed to pursue low-tax, small government policies in Washington and has...