FWIW...
The transcript of GEN Powell's appearance on
Meet the Press during which he endorsed the Democratic Party's candidate for the presidency is
here.
Other prominent Republicans who endorsed the Democratic Party's nominee are discussed
here and
there.
Could it be that many Republicans figured out a bit sooner than others (including myself

) that there was more sizzle than substance to Governor Palin and didn't want to risk having her as the president?
Naw...