If the computer is limited to 100 points, then why does McCain have a stance on almost every issue at the first turn?
Can you give me some more details on this particular problem? This shouldn't be possible. I just started up a game on Masochistic as Obama and played against McCain and, at the beginning, McCain has a -1 stance on Illegal Immigration and -95 on Withdrawing from Iraq. At end of the first turn his stance on Illegal Immigration changed to -5 after he made a speech on the same issue. His candidate issue page, though, still showed only those two issues - nothing else.
Also, what window are you looking at that is giving you this data? Are you looking at the Candidate Details/Issue window or the State Details one?
If you're talking about the State Details window then the stances on issues for each candidate is decided by the default position/importance that each party has on an issue. A Republican candidate has a default stance not in favor of Withdrawal from Iraq whereas a Democratic candidate has a default stance in favor of it; the actual values for this can vary from state to state. Both parties have these default values but the extent of the score for each issue varies by issue and by state/region.
Also, doing it this way completely takes the minor issues off the table. Why spend precious points or TV ads taking a stance on the missile defense system if no one cares? There are about 20 or 30 issues that become completely irrelevant and not worth taking a stand on.
Actually, the minor issues can be used as a strategy. When you give a speech on an issue (or take an ad out, though that is a more progressive change) you're making the issue increasingly important to people regardless of whether you favor it or are not in favor of it.
So, let's say that "Law Enforcement" is a particularly important issue for my campaign. The left, the right, and independents are in favor of enforcing the nation's laws; the variance on the issue is how important Law Enforcement is to each party. So I give about four-five speeches on the issue and it rises to the second most important issue in the state. Now my candidate, Obama in this case, is triple-thumbs-up in favor of Law Enforcement and I've raised the importance of the issue across both Republicans and Independents ten-fold.
So don't completely discount the minor issues; they can almost always be used as a strategic platform.