US Republican Nomination Update.

To gain the nomination, Mr Romney must accumulate 1,144 delegates to the Republican National Convention - allocated through state-by-state primary elections and caucuses. Romney is on pace to capture the nomination in June unless Santorum or Gingrich is able to win decisively in the coming contests.
Before Puerto Rico's vote was in, Mr Romney had 501 delegates, more than all of his rivals combined. Rick Santorum stands at 253, former House Speaker Newt Gingrich has 136, and Texas representative Ron Paul is at 50, according to an Associated Press projection. (Express.)