He's amassed twice the delegates of rival Romney. But the GOP's conservative wing remains resistant to his campaign.
Other challenges – potential recession, budget deficits, and rising entitlement spending – could overshadow military priorities.
The former first lady's imposing national lead among Democratic voters faded leading up to the 22-state sweepstakes.
McCain leads by 19 points nationally, but Romney could benefit from anti-McCain votes.
Having a global positioning system in the car is fun – until the driver doesn't follow the directions it gives.
Superdelegates, or party professionals, could play a decisive role in the outcome of the Democratic race.
Readers write about the extent of Barack Obama's appeal and the specifics of his campaign.
In his final year, the president proposes a modest agenda at home.