McKinley is like Bush in that the two of them invaded countries (in McKinley's case, an Asian possession of Spain, with which the US was at war over possessions in the Caribbean) which were no imminent threat to the US for strategic reasons, only to encounter a mixed reception from the people who lived there.

Both Presidents claimed missionary purposes: Bush to bring democracy to Iraq, McKinley to bring Christianity to the (Catholic) Philippines.

For a little more about McKinley, including who shot him, please visit whitehouse.gov, where you will find a succinct biography of McKinley from a reliable source. Another article you may find useful is "Is President Bush Repeating McKinley's Mistake in the Philippines?", from George Mason University's History News Network. It outlines the Philippines campaign without mention of the Germans.

Germany, having just become a unified nation in 1871, was playing catch-up with other Western European powers in the colonial game in the late 19th century. A more thorough description of German naval strategy and ambitions may be found here: "German War Plans in the Pacific, 1900-1914", reprinted online from the journal The Historian, unfortunately in teenytiny eyestrainovision. Also, American Historical Review apparently published an authoritative article (cited on the US Navy site in its bibliography of the Battle of Manila Bay), "Dewey and the Germans at Manila Bay". It unfortunately is not available to non-subscribers online, except for its first page, here. This clearly states, however, that the "confrontation", which occurred on June 12, 1898, did not occur at a time when Germany was prepared to wage war and in any case was a misunderstanding by the Germans of the American procedures while occupying Manila Bay. The Germans were not the big pushy factor described in the Wikipedia article.

Your request for a link to the text of Take It Back: Our Party, Our Country, Our Future, by James Carville and Paul Begala, will have to remain unsatisfied for the moment. It's a book, not available online, though you can read the introduction after you scroll down through the editorial reviews.