For McCain and Obama, Calif. marriage ban could have national import Presumptive presidential nominees Barack Obama and John McCain reportedly are walking a careful line with their stances on the California marriage ban ballot measure, with the former opposing it and the latter backing it. The issue is especially tricky for McCain, who can use his anti-marriage-rights position to shore up his credentials with religious conservatives, but risks alienating independent voters, who typically don't rank marriage as an important issue, according to this article. Los Angeles Times ...