Presumptive presidential candidates Sen. John McCain and Sen. Barack Obama both claim that they can redraw the electoral map this year by courting voters from the other party's traditional base. Political analysts Stuart Rothenberg and Amy Walter discuss the 2008…

Facing another must-win political battle, Sen. Hillary Clinton emerged victorious Tuesday in the Pennsylvania Democratic primary, but it's unclear how much the victory will help close her delegate deficit against the better-funded Sen. Barack Obama.