Kagan is an informal foreign policy adviser to the Republican senator John McCain, who remains the favoured neoconservative choice for the White House because of his backing for the troops in Iraq.
But in an article in the Washington Post, Kagan wrote approvingly that a keynote speech by Obama at the Chicago Council on Global Affairs was "pure John Kennedy", a neocon hero of the cold war.
In his speech, Obama called for an increase in defence spending and an extra 65,000 soldiers and 27,000 marines to "stay on the offense" against terrorism and ensure America had "the strongest, best-equipped military in the world". He talked about building democracies, stopping weapons of mass destruction and the right to take unilateral action to protect US "vital interests" if necessary, as well as the importance of building alliances.
"Personally, I liked it," Kagan wrote.
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