Basically, Obama is trying to suggest that Clinton is becoming less relevant. We will have to wait until the results of March 4th are here, to decide if Clinton tanks in the numbers from Ohio and Texas.
The “straight talk express” of McCain is attacking Obama because if they can get Clinton nominated, they have a much better chance of winning in November against Hillary. Clinton has a loyal following of, let’s say, 38% of total voters. Clinton doesn’t have widespread support; certainly not enough to win in November’s general election.
Obama has converts joining his Campaign everyday - people who will be voting for the first time, people who are Bush haters, and people who are Clinton haters who weren’t going to vote, but may vote now that they see Obama has a chance to win.
Notice how quickly the “stay the course a few more years” mantra from the Bush Admin has become stay 50 to 100 years in Iraq from the “straight talk express.” When George W Bush speaks in anyway against either Obama or Clinton, that just drives more people to determinantly elect a Democrat for President. There is a core of McCain supporters, let’s say 38%, who are die-hard Bush Admin supporters who will vote Republican regardless of the economy or Iraq War. McCain doesn’t have widespread support; certainly not enough to win in November’s general election.
I see a virtual tie between Clinton and McCain with a slight advantage for Obama beating McCain with popular votes in November. But, the electoral college could support McCain due to pressure from Big Business, Wall Street, and Hispanics who want immigration reform, McCain style.
The election coud be a repeat of 2000, decided by the U.S. Supreme Court.
If you watch Clinton, there is not much likeable - either from frumpy Hillary, to finger wagging Bubba Bill. Obama benefits each time Bill Clinton is on TV wagging his finger and getting red-faced at some schmuck at a rally. Hillary is more focused on her experience than on leading a united country. Isn’t all that “experience” the reason we went to War in Iraq in the first place?
During the H W Bush Admin the U.S. was an ally to Iraq. George W’s decision to invade Iraq was personal, had nothing to do with intelligence or lack thereof. But to answer your question, Obama has to walk the fine line between appearing arrogant and avoiding bickering with Clinton. When Clinton and Obama bicker, then McCain gains votes.