Too "juvenile" to lead?

Newsweek columnist Jonathan Alter seems to think there's a candidate in the race for President of the USA who is behaving a juvenile, immature manner:

In the middle of John McCain's dopey Britney & Paris attack ad, the announcer gravely asks of Barack Obama: "Is He Ready to Lead?" An equally good question is whether McCain is ready to lead. For a man who will turn 72 this month, he's a surprisingly immature politician—erratic, impulsive and subject to peer pressure from the last knucklehead who offers him advice. The youthful insouciance that for many years has helped McCain charm reporters like me is now channeled into an ad that one GOP strategist labeled "juvenile," another termed "childish" and McCain's own mother called "stupid." The Obama campaign's new mantra is that McCain is "an honorable man running a dishonorable campaign." Lame is more like it. And out of sync with the real guy.

[bold added]