President Bush is squeezing in some campaigning before the political spotlight turns to next week's Democratic National Convention in Boston. Bush's twin daughters, Barbara and Jenna, were to accompany him Tuesday. It's the first time they have made joint appearances with their dad on the campaign trail, although they each have traveled separately with him on other outings. The twins also will take part in an online chat Friday on Bush's re-election Web site. Bush flies to re-election rallies in Iowa and Missouri, toss-up states that he and Democratic rival John Kerry are fighting hard to win this year. Bush...