If he is so stupid, then it should be quite easy for the GOP to find candidates that are smarter.
Why hasn't that happened yet?
Don't be an idiot.
You think being elected President has anything to do with intelligence? Was GW Bush elected twice because he was so brilliant?
Obama has the entire media in his pocket and even the GOP debates are moderated by his cronies. He has raised close to 1 billion dollars for his reelection effort. That's billion with a B. Historically the incumbent has an edge in Presidential elections.
Year Candidate Votes Candidate Votes Winner Notes
Presidential elections since 1936 with an incumbent
1936 Roosevelt 523 Landon 8 Incumbent 
1940 Roosevelt 449 Willkie 82 Incumbent 
1944 Roosevelt 432 Dewey 99 Incumbent 
1948 Truman 303 Dewey 189 Incumbent 
1956 Eisenhower 457 Stevenson 73 Incumbent 
1964 Johnson 486 Goldwater 52 Incumbent 
1972 Nixon 520 McGovern 17 Incumbent 
1976 Carter 297 Ford 240 Challenger 
1980 Reagan 489 Carter 49 Challenger 
1984 Reagan 525 Mondale 13 Incumbent 
1992 Clinton 370 GHW Bush 168 Challenger 
1996 Clinton 379 Dole 159 Incumbent 
2004 GW Bush 286 Kerry 252 Incumbent 
Finally, Osama has the mindless black vote, the equally mindless class warfare vote, the bicycle seat sniffing white intellectual lib vote, all labor unions as his acting henchmen and several other constituencies that make up his broad based leper colony of support.
And FYI genius, not a single vote has been cast in a single primary. It's kind of hard to dethrone Obama when the GOP hasn't even chosen a nominee. Obama's idiocy will be a spectacle for the world to see once the debates start. The only GOP candidate who probably lacks the heart or will or desire to cut Obama's balls off on national television is Romney-- hence most GOP voters are extremely unenthusiastic about voting for him.