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At the end of the article there's the suggestion that the Republican and Democrat parties might unite similarly, but the Republican party nomination was dramatically different. The media heavily pushed the Obama candidacy and sought to damage and end the Clinton campaign for months which Clinton supporters know is unfair. McCain doesn't have that burden to deal with which makes it much easier to unify his party. He is believed to have earned the nomination without special treatment from the media.
Also, Obama supporters were often extremely insulting to Clinton and her supporters on the blogs, in the news, etc. whereas Clinton supporters were much more mature and positive, And this is another hurdle the Obama campaign would have to deal with if Obama is nominated. In contrast, the McCain supporters did not treat other candidates in a public bullying and abusive manner which makes it easier for McCain to unify his party.
Furthermore, the Republicans did not have an intra-party insurgency. Their campaign was an open field which generally makes it much easier to unify the party once a nominee is chosen. In contrast, the Obama insurgency battled the party favorite (Clinton). Intra-party insurgencies have often damaged a party's chances of winning the general election. That is why the Republicans will have a much easier time unifying the party. Considering Clinton was the party favorite, got more votes and benefited from supporters who were more mature and positive toward other campaigns, she is the best able to unite the Democrats and undo the enormous damage the Obama campaign inflicted on the Democratic party. United with Hillary we can win the general election as the polls are showing now.