Positive advertisements will be broadcast about Representatives Mark Udall of Colorado, Joseph M. Hoeffel of Pennsylvania and Brian Baird of Washington, all Democrats.
Until this week, Ms. Gillibrand had only released positive advertisements about her efforts to make Congress more transparent, and about her advocacy for her native upstate New York.
He has run a classic front-runner's race this time, resisting calls for more debates and broadcasting mostly positive advertisements highlighting his business experience.
And he was showing it in other ways that went largely undetected: As his campaign ran glossy, positive advertisements against Mr. McCain on national television, it showed bruising, sometimes misleading ones on the radio and in local markets.
It may be a distant memory now, but the mayoral race began in April with series of positive advertisements extolling the mayor's record (on education and crime) and pledging progress in a third term (by saving thousands of jobs and units of housing for people of lesser means).
For now, they are calibrating their mainly positive advertisements to reflect the themes playing out here: change vs. status quo politics, new ideas on domestic concerns and Iraq vs. old thinking, the need for fresh leadership, and their respect for the first-in-the-nation Iowa caucuses.
