Mitt Romney is officially joining in the Republican effort to unite behind John McCain. CNN reports that Romney will endorse McCain today at an event scheduled for 3:30 p.m. ET in Boston, and will ask his delegates to vote for McCain.

When he dropped out last week, Romney said that a continued primary fight would delay the launch of a national effort against the Democrats. After a brief period of mourning for his campaign, endorsing McCain was the next logical step, and definitely a necessary one if he wants to remain in the good graces of the Republican establishment.