With the Alabama and Mississippi primaries now complete, and with the Hawaii caucuses counted, more than half of the states (accounting for 41 percent of the delegates) are now in the books in the Republican presidential race. Through these first 26 states, Mitt Romney has won 52.7 percent (496 of 942) of the available delegates, a shade over the 50 percent rate he must eclipse in order to secure a majority of the delegates (1,144 of 2,286) before the GOP convention. So while Romney is currently on pace to win the nomination before the convention, he doesn’t have much margin for error. In fact, to hit that target, he needs to win 48.2 percent of the remaining delegates.