Eyes on Rubio as Republicans take debate stage in Milwaukee

By Emily Stephenson and James Oliphant MILWAUKEE/WASHINGTON (Reuters) - Republican presidential candidates take the stage in Milwaukee on Tuesday night in an economic themed debate with voters and donors looking to see if U.S. Senator Marco Rubio can produce another strong performance like the one he delivered two weeks ago. Eight Republicans seeking the party's nomination for president in the November 2016 election will debate over a range of economic issues on Fox Business Network. Voters will