From my experience....
.... over many elections, things can change. Consider that the senior President Bush even had other Republicans challenging him as the next election loomed, even though the Gulf War had gone well. Some pundits said it was because he had to raise taxes.
Common, too, is for a scandal or scandals to strike the Hill - these are equal opportunity events. As well, second terms can not be as successful as first ones.
It has also been common for voters to change horses in mid-term elections. Then they either stick with that party, or return to the other during the presidential ones.
Are voters fickle? Perhaps. At least they are unpredictable as to what events, or statements, or legislation influences them. Each party has their core base, and dynamite wouldn't change that.
So, IMO, it's a little early to cheer. There are still several months to go before names are solidified on the ballots. Both sides will be courting their core and non-core voters. It will cost lots of money, and we will be bombarded with TV ads. Not long after, it will start again for 2008.
It should be fun, and would if meanness didn't enter in.
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