Because Barack Obama has adopted so many core Republican beliefs -- particularly in the realm of foreign policy -- the Republican race is a shambles.
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In fairness to the much-maligned GOP field, they face a formidable hurdle: how to credibly attack Obama when he has adopted so many of their party's defining beliefs. Depicting the other party's president as a radical menace is one of the chief requirements for a candidate seeking to convince his party to crown him as the chosen challenger. Because Obama has governed as a centrist Republican, these GOP candidates are able to attack him as a leftist radical only by moving so far to the right in their rhetoric and policy prescriptions that they fall over the cliff of mainstream acceptability, or even basic sanity.
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How do you scorn a president as a far-left socialist when he has stuffed his administration with Wall Street executives, had his last campaign funded by them, governed as a "centrist Republican", and presided over booming corporate profits even while the rest of the nation suffered economically?
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..when it comes to the foreign policy and civil liberties values Democrats spent the Bush years claiming to defend, the only candidate in either party now touting them is the libertarian Ron Paul, who vehemently condemns Obama's policies of drone killings without oversight, covert wars, whistleblower persecutions, and civil liberties assaults in the name of terrorism.