The choice of a running mate is one of the most important decisions for a presidential candidate. The right one can compensate for perceived gaps in background, experience and geography.

Being selected as a vice-presidential nominee increases the chances of later winning the party's presidential nomination. Several governors have been mentioned as potential running mates for McCain.

— The New York Times, staff

• Minnesota governor Tim Pawlenty, an early supporter.

• Charlie Crist of Florida, whose last-minute endorsement helped McCain win that crucial swing state's primary.

• Jon Huntsman Jr. of Utah, an early supporter despite Mitt Romney's popularity in his state.

• Mark Sanford of South Carolina, whose conservative reputation could help McCain with the Republican base.

Other candidates:

• Sonny Perdue, Georgia governor

• Tom Ridge, former Pennsylvania governor

• Mitt Romney, former Massachusetts governor

• Rob Portman, a former Ohio congressman