"Uncertain and Erratic Behavior"

On October 9th, Obama called out Senator McCain for his "uncertain" and "erratic behavior."  Here, again, we see the importance of leadership in the campaign.  It is imperative for any successful candidate to establish himself as someone who is both trustworthy and credible.  In this short 1 minute clip, we see a variety of tactics used.

In describing how McCain's stance has fluctuated, Obama is demonstrating his opponent's uncertainty and lack of care. According to Obama, even with his new plan, he is punishing taxpayers and failing to solve our housing crisis.  Furthermore, he is hinting that McCain is inept and fails to understand the true ramifications of the problem.  He concludes by stating that McCain's "erratic and uncertain leadership in these uncertain times" is unfitting. We need someone whom is both steady and trustworthy.

I could not help but wonder if Obama was indirectly hinting at McCain's age for his "erratic" behavior.  It is something interesting to think about.  Perhaps he is playing off his opponent's "disadvantage" by claiming he is unfit to lead our nation under these conditions.  Any thoughts?