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By CNN’s Wolf Blitzer
(CNN) - At this point eight years ago, in September 2003, several national polls showed Howard Dean and Wesley Clark were one and two in the race for the Democratic presidential nomination.
At this point four years ago, in September 2007, several national polls showed Rudy Giuliani and Fred Thompson were one and two in the race for the Republican presidential nomination.
Right now, the national polls show Rick Perry and Mitt Romney are number one and two in the race for the Republican nomination.
So does that mean Perry and Romney will fade as the other four did?
Not necessarily. One of them might yet win the nomination.
On the other hand, someone else could win as well – someone already in the race for the nomination or, perhaps, someone who is yet to jump in.
In other words, it is still very much a wide open race.
There’s a lot of uncertainty, and that’s why I love covering politics.
There are many different scenarios that could yet unfold, including a lengthy primary battle similar to the Barack Obama-Hillary Clinton contest four years ago. Remember, we didn’t know the winner until June 2008 – just weeks before the Democratic convention in Denver. That could happen again now in the Republican race for the White House.
One other possibility is even more dramatic. The contest actually could continue until the Republican convention next summer in Tampa, Florida. Some GOP insiders already have speculated about that.
And don’t forget there is yet another huge wild card – the possibility of a serious third-party candidate yet emerging.
Bottom line: get ready for a wild political ride.
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