Ahem (
http://www.lucasforums.com/showthread.php?t=181612). ;)
As an update for close elections (margin of error is around 3%), using RCP:
Rudy Giuliani (R) vs. Hillary Clinton (D): [Clinton +1.0%]
Rudy Giuliani (R) vs. Barack Obama (D) [Obama +3.4%]
Rudy Giuliani (R) vs. John Edwards (D) [Edwards +2.0%]
John McCain (R) vs. Hillary Clinton (D) [Clinton +3.7%]
John McCain (R) vs. John Edwards (D) [Edwards +4.0%]
The other candinates have the Democrats defeating the Republicans by a higher margin.
Adding in a Rudy Giuliani vs. Hillary Clinton vs. Bloomberg (an unlikely event due to the fact Bloomberg likes those people)...
Giuliani (37.0%) vs. Clinton (42.6%) vs. Bloomberg (11.6%) vs. Indepedents (6.6%). [Clinton +5.6]
In other words, if Bloomberg enters into the race, he'll throw the Popular Vote over to Clinton. Bloomberg, as a third party candinate, will hurt the Republicans more than the Democrats, even when there is allegations that Bloomberg is a RINO due to his liberal policies.
Note too that while the other Republicans candinates get soundly defeated by the Democrat candinates, it might turn back into a close race once the Negative Campagin kicks in.
Who I think will win depends on who gets nominated on both sides, but I think the Republicans might have an edge. People don't like Bush, but he's not running in the election. And while Iraq might be a big issue, the war is not everything. There are stuff such as economic policies, health care, domestic security, diplomacy, etc.
Note this too, that it is becoming a trend that whomever is the Party in power, they will lose seats in the next election. The reason is that people will be disappointed in the Party and want change. So if the Democrats seize the Presidency, they may be preparing themselves to lose control of Congress in 2012...something that might not be a good idea.
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Third-parties indeed tend to hurt one party, so, in order to neturalize that third-party, all the Big Party has to do is just adopt all the positions of the Third Party. It upsets both the Big Party's followers that they are being hijacked by a smaller party, and it upsets the Third-Party that the Big Party is just plagrizing their national agenda. But it's how Third Parties influnce elections and party platforms in the past. :)
Not sure about the present though. Nobody is clamoring for people to join up with Nader, or the Consitutional Party, so the third parties are so small that the Big Parties won't see a need to shift their positions. Ron Paul has about, say, 1% support, but I do know of many Libertairans just changing parties to Republican.