Mitt Romney will endorse John McCain for the GOP presidential nomination today.

A source familiar with the decision said Romney wants to endorse McCain “in the interest of healing.”

The source said Romney also wants to help McCain move faster to “secure the nomination and unite the party for the general election against the Democrats for November.”

Romney will “release” his delegates to McCain, meaning he will encourage them to get behind McCain’s candidacy. the source said.

Many pundits have said that a McCain/Romney ticket wouldn’t be possible, considering the personal acrimony that is said to exist between the two.

Then again, Reagan and H.W. Bush put aside differences in 1980 to win big.