The Republican nomination for president is completely up for grabs, but there's a lot of agreement on who the vice presidential pick should be: Marco Rubio, the freshman senator from Florida. My contacts in the Mitt Romney camp are boasting: "Doesn't a Romney-Rubio ticket sound great?" One senior Romney advisor told me: "We think that could be a dream ticket." Operatives from the pack of other wannabes are thinking ahead to the same Rubio marriage with their candidate.