A primary motivator for Colin Powell's public endorsement of Barack Obama for president appears to have been the character of the negative attacks by the McCain campaign.
Appearing generally somber and thoughtful during his remarks following the taping of Meet the Press, former Secretary of State Powell became most animated during his discussion of the nature of John McCain's campaign strategy during recent weeks. Negative campaigning that sticks to highlighting realities is one thing -- but the distortions, slurs and race baiting implemented by the McCain campaign are another animal altogether. Their use by a candidate who has built his reputation on his professed integrity has puzzled, shocked and repelled many in the Republican Party who, like Powell, have known John McCain for years.
~snip~
In the end, however, one man in the Republican Party truly has decided to put "country first" - and that man is Colin Powell.
More here:
http://www.huffingtonpost.com/leah-mcelrath-renna/who-really-puts-country-f_b_135920.html