At National Review Online, Representative Darrell Issa (R-CA) observes that some commentators have favorably likened our current president to Richard Nixon.  He argues that there are key differences, too:

Regrettably, President Obama is failing where Richard Nixon succeeded. Nixon was ever-willing to meet at the negotiating table, but only as a tactic that complemented his overall strategy of engagement. Thus far, POTUS 44 almost exclusively prefers the policy of outstretched hands and summits, without the diplomatic finesse and appreciation for American power that can keep our enemies guessing. Nixon never showed all his cards, and somehow managed to convince the world that he was holding trumps. President Obama, like Carter before him, gives the endless impression that his strongest bet is always a bluff.