Going to Latin America in the midst of a presidential campaign, [McCain] said, speaks less to his role as a senator than to what he's hoping to achieve if elected this fall. "It's more my ability to govern as president," he said, "my ability to lead as president, to keep up with these major issues."

Obama is a gamble, no doubt, he could be bad news or he could be playing the game, and if elected ready to do some positive damage.  Who knows?

Right?  

People don't join the military to do specific things for specific people or groups of people in the United States.  They go because they have a Commander in Chief who has asked them to go and they go to fight for our country and the values we hold.  
McCain was a POW because he was serving our country AND doing what his Commander in Chief told him to do.

POW may not equal "Presidential Material" but serving your country does add to your credentials.  

And giving a speech in Germany doesn't make someone "Presidential Material" either.  

The problem was that McCain changed everything once he started to run for president.  Sure, he was the only GOP Senator (other than Chafee) to vote against Bush's tax cuts, but now he wants to make them permanent.  And there's more:

• McCain supported the drilling moratorium; now he's against it.

• McCain strongly opposes a windfall-tax on oil company profits. Two months ago, he was perfectly comfortable with the idea.

• McCain thought Bush's warrantless-wiretap program circumvented the law; now he believes the opposite.

• McCain wanted to change the Republican Party platform to protect abortion rights in cases of rape and incest. Now he doesn't.

• McCain thought the estate tax was perfectly fair. Now he believes the opposite.

• He opposed indefinite detention of terrorist suspects. When the Supreme Court reached the same conclusion, he called it "one of the worst decisions in the history of this country."

• McCain was brave when he said, flatly, that waterboarding was indeed torture.  Then he voted to permit the CIA to use it.

• McCain supported moving " towards normalization of relations" with Cuba. Now he believes the opposite.

• McCain believed the U.S. should engage in diplomacy with Hamas. Now he believes the opposite.

• McCain believed the U.S. should engage in diplomacy with Syria. Now he believes the opposite.

• McCain supported the Lieberman/Warner legislation to combat global warming. Now he doesn't.

As for your comment that Obama doesn't even like Democrats, that's ridiculous.  

And to try to associate Obama with Hitler is a ridiculously low blow.

McCain being pulled from Truc Bach Lake in Hanoi and becoming a POW[35] on October 26, 1967.
Although McCain was badly wounded, his captors refused to treat his injuries, instead beating and interrogating him to get information.[36] Only when the North Vietnamese discovered that his father was a top admiral did they give him medical care.[36] His status as a prisoner of war (POW) made the front pages of The New York Times[37] and The Washington Post.[38]
McCain spent six weeks in the hospital while receiving marginal care.[33] Now having lost 50 pounds (23 kg), in a chest cast, and with his hair turned white,[33] McCain was sent to a different camp on the outskirts of Hanoi[39] in December 1967, into a cell with two other Americans who did not expect him to live a week.[40] In March 1968, McCain was put into solitary confinement, where he would remain for two years.[41]
In mid-1968, McCain's father was named commander of all U.S. forces in the Vietnam theater, and McCain was offered early release.[42] The North Vietnamese wanted to appear merciful for propaganda purposes,[43] and also wanted to show other POWs that elites like McCain were willing to be treated preferentially.[42] McCain turned down the offer of repatriation; he would only accept the offer if every man taken in before him was released as well.[33]
In August of 1968, a program of severe torture began on McCain.[44] He was subjected to rope bindings and repeated beatings every two hours, at the same time as he was suffering from dysentery.[33][44] Further injuries led to the beginning of a suicide attempt, which was stopped by guards.[33] After four days, McCain made an anti-American propaganda "confession".[33] He has always felt that his statement was dishonorable,[45] but as he would later write, "I had learned what we all learned over there: Every man has his breaking point. I had reached mine."[46] His injuries left him permanently incapable of raising his arms above his head.[47] He subsequently received two to three beatings per week because of his continued refusal to sign additional statements.[48] Other American POWs were similarly tortured and maltreated in order to extract "confessions" and propaganda statements.[49]